a-

From Ancient Greek ἀ- (a-) (ἀν- (an-) immediately followed by a vowel).

ai-

before a palatalized consonant, both etymologies


h

na habhann

fáilte go hÉirinn

chomh hard le crann


il-

From il (“much, many”), from Old Irish il, from Proto-Indo-European *pelh₁- (compare Ancient Greek πολύς (polús, “much”)).


il-

il- (mutation mutation-radical)
n-il- (eclipsis mutation)
hil- (mutation prothesis-h)
t-il- (mutation prothesis-t)

Alternative form of oll- (“great, gross”)


im-

head

im- (lenites except with m; becomes iom- before broad m)

From Old Irish imm-, from Proto-Celtic *ambi-, from Proto-Indo-European *h₂m̥bʰi.


im-

im- (intensive particle; lenites except with m; becomes iom- before broad consonant or vowel)


in-

in- + ite → inite (“edible”)

in- + déanta → indéanta (“doable”)

(productive) able to, -able (+ past participle)

in- + feidhm (“function”) → infheidhme (“able to function, serviceable”)

in- + aistear (“journey”) → inaistir (“seaworthy”)

in- + leigheas (“healing”) → inleighis (“curable”)

able to, -able, fit for, fit to be (+ genitive of a (verbal) noun)


in-

in- (mutation mutation-radical)
n-in- (eclipsis mutation)
hin- (mutation prothesis-h)
t-in- (mutation prothesis-t)

A prefixed form of the preposition i (“in”). Partly inherited from Old Irish in- (“in”), e.g. in- + ceann (“head”) → inchinn (“brain”), but most words with this suffix are loans or loan translations of ultimately Latin or Greek origin, e.g. ionscóp (“endoscope”)‚ ionsoilsigh (“illuminate”).


bi-

bi- (mutation mutation-radical)
bhi- (lenition mutation)
mbi- (eclipsis mutation)

Alternative form of bith-, used before a slender T.


bio-

bio- (mutation mutation-radical)
bhio- (lenition mutation)
mbio- (eclipsis mutation)

Alternative form of bith-, used before a broad T.


neo-

From Ancient Greek νεο- (neo-), from νέος (néos, “new, young”).


geo-

From Ancient Greek γεω- (geō-), combining form of γῆ (gê, “earth”).


an-

From Old Irish an-, from Proto-Celtic *an-, from Proto-Indo-European *n̥-.

(with adjectives, always spelled with a hyphen) very

(with adjectives) over-, excessively, intensely


an-

From Old Irish an-, in-, from Proto-Celtic *an-, from Proto-Indo-European *n̥-.

ain-

used before slender vowels and consonants


an-

an- (mutation mutation-radical)
n-an- (eclipsis mutation)
han- (mutation prothesis-h)
t-an- (mutation prothesis-t)


dis-

dis- (mutation mutation-radical)
dhis- (lenition mutation)
ndis- (eclipsis mutation)


for-

for- (mutation mutation-radical)
fhor- (lenition mutation)
bhfor- (eclipsis mutation)


para-

para- (mutation mutation-radical)
phara- (lenition mutation)
bpara- (eclipsis mutation)


ur-

ur- (mutation mutation-radical)
n-ur- (eclipsis mutation)
hur- (mutation prothesis-h)
t-ur- (mutation prothesis-t)

Alternative form of for- (“over, superior, super-; outer, external; great, extreme”)


ana-

ana- (mutation mutation-radical)
n-ana- (eclipsis mutation)
hana- (mutation prothesis-h)
t-ana- (mutation prothesis-t)

an-

used before a vowel in Munster; used in all positions in Connacht and Ulster


dé-

dé- (mutation mutation-radical)
dhé- (lenition mutation)
ndé- (eclipsis mutation)


do-

do- (mutation mutation-radical)
dho- (lenition mutation)
ndo- (eclipsis mutation)

From Old Irish do-, du-, from Proto-Celtic *dus-, from Proto-Indo-European *dus-.


ban-

ban- (mutation mutation-radical)
bhan- (lenition mutation)
mban- (eclipsis mutation)

ban- + ab (“abbot”) → ban-ab (“abbess”)

ban- + draíodóir (“magician”) → bandraíodóir (“enchantress”)

ban- + stiúrthóir (“director; conductor”) → banstiúrthóir (“directress, directrix; conductress”)

A prefix appended to words to make a female form, similar to -ette or -ess in English

bain-

used before a slender consonant or vowel


leas-

Cognate to Welsh llys-, Breton lez-, Manx lhiass-.

leasathair, leasmháthair

leasrí, leasuachtarán

leasainm


iar-

iar- (mutation mutation-radical)
n-iar- (eclipsis mutation)
hiar- (mutation prothesis-h)
t-iar- (mutation prothesis-t)


so-

so- (mutation mutation-radical)
sho- (lenition mutation)
tso- (lenition mutation)

From Old Irish so, su, from Proto-Celtic *su-, from Proto-Indo-European *h₁su-. Cognate with Welsh hy-, Ancient Greek εὖ (eû), Sanskrit सु- (su-). Doublet of eo-.


ath-

ath- (mutation mutation-radical)
n-ath- (eclipsis mutation)
hath- (mutation prothesis-h)
t-ath- (mutation prothesis-t)

From Old Irish aith-, ath-, from Proto-Celtic *ati-.


fear-

fear- (mutation mutation-radical)
fhear- (lenition mutation)
bhfear- (eclipsis mutation)


uile-

uile- (mutation mutation-radical)
n-uile- (eclipsis mutation)
huile- (mutation prothesis-h)
t-uile- (mutation prothesis-t)


hist-

Alternative form of histi- used before vowels.


ró-

From Old Irish ro-, from Proto-Celtic *ɸro-, from Proto-Indo-European *per-. Cognate of Welsh rhy-, Old Breton ro- (Breton re-); cognate of English fore, Latin prō. Compare Scottish Gaelic rò-.

(with adjective) very (in a negative way)


mí-

mí- (mutation mutation-radical)
mhí- (lenition mutation)

From Old Irish mí- (compare Scottish Gaelic mì-), from Proto-Indo-European *mey- (“to change”). Cognate with English mis-, Latin minus (“lesser”), Ancient Greek μείων (meíōn, “less”).

bad, ill-, evil, dis-, mis-, mal-

un-, in-, dis-, mis-


neamh-

From Middle Irish nem-, from Old Irish neph- (compare Scottish Gaelic neo-, Manx neu-).


droch-

droch- (mutation mutation-radical)
dhroch- (lenition mutation)
ndroch- (eclipsis mutation)

From Old Irish droch (“bad”), from Proto-Celtic *drukos. Cognates include Welsh drwg, Breton drog, Scottish Gaelic droch.


leath-

lying, turned, to one side; lopsided, tilted


éa-

From Old Irish é-, from Proto-Celtic *an-, from Proto-Indo-European *n̥-. Related to Old English un- (modern English un-, Latin in-, Ancient Greek ἀ- (a-), and Sanskrit अ- (a-).


tar-

tar- (mutation mutation-radical)
thar- (lenition mutation)
dtar- (eclipsis mutation)

From Old Irish tar (“over, across”). Related to thar.


bréag-

bréag- (mutation mutation-radical)
bhréag- (lenition mutation)
mbréag- (eclipsis mutation)

bréag- + eolas (“information”) → bréageolas (“false information”)


os-

os- (mutation mutation-radical)
n-os- (eclipsis mutation)
hos- (mutation prothesis-h)
t-os- (mutation prothesis-t)


fo-

fo- (mutation mutation-radical)
fho- (lenition mutation)
bhfo- (eclipsis mutation)

From Old Irish fo- (“under, beneath; about, around”) (compare modern faoi), from Proto-Celtic *uɸo-, from Proto-Indo-European *upo (“under, up from under”).

der

sub-, under-, hypo-, secondary, subsidiary


tras-

tras- (mutation mutation-radical)
thras- (lenition mutation)
dtras- (eclipsis mutation)


aer-

aer- (mutation mutation-radical)
n-aer- (eclipsis mutation)
haer- (mutation prothesis-h)
t-aer- (mutation prothesis-t)

Alternative form of aera- (“aero-, aerial; pneumatic”)


dea-

dea- (mutation mutation-radical)
dhea- (lenition mutation)
ndea- (eclipsis mutation)

From Old Irish dag- (“good”), from Proto-Celtic *dagos (“good”) (compare Welsh da).


r-

An abbreviation of ríomh- (“electronic”).


féin-

féin- (mutation mutation-radical)
fhéin- (lenition mutation)
bhféin- (eclipsis mutation)


comh-

comh- (mutation mutation-radical)
chomh- (lenition mutation)
gcomh- (eclipsis mutation)

From Old Irish com-, from Proto-Celtic *kom-, from Proto-Indo-European *ḱóm (“with”). Compare Welsh cyf-, Latin com-.


fóta-

fóta- (mutation mutation-radical)
fhóta- (lenition mutation)
bhfóta- (eclipsis mutation)

From the combining form φωτ- (phōt-) of Ancient Greek φῶς (phôs, “light”).


aon-

aon- (mutation mutation-radical)
n-aon- (eclipsis mutation)
haon- (mutation prothesis-h)
t-aon- (mutation prothesis-t)


bain-

bain- (mutation mutation-radical)
bhain- (lenition mutation)
mbain- (eclipsis mutation)

bain- + inscne (“gender”) → baininscne (“feminine gender”)


próta-

próta- (mutation mutation-radical)
phróta- (lenition mutation)
bpróta- (eclipsis mutation)

Borrowed from Ancient Greek πρωτο- (prōto-).


ríomh-

From ríomh (“enumeration, calculation”), from Old Irish rím, from Proto-Celtic *rīmā (“number”) (compare Welsh rhif).


príomh-

príomh- (mutation mutation-radical)
phríomh- (lenition mutation)
bpríomh- (eclipsis mutation)

From Old Irish prím-, from prím (“first, primary”) (compare Scottish Gaelic prìomh-, Manx preeu-, Welsh prif-), from Latin prīmus.


ceann-

ceann- (mutation mutation-radical)
cheann- (lenition mutation)
gceann- (eclipsis mutation)


bun-

(except of d, s, t) (triggers-lenition)
bun- (mutation mutation-radical)
bhun- (lenition mutation)
mbun- (eclipsis mutation)

basic, fundamental, primary, ultimate, original, base, elementary


síor-

síor- (mutation mutation-radical)
shíor- (lenition mutation)
tsíor- (lenition mutation)

From síor (“eternal, perpetual; continual”), from Old Irish sír (“lasting, constant”) (compare Manx sheer-, Scottish Gaelic sìor-).

síorchaint

(act of) talking continually; never-ending talk

síoraí

eternal, perpetual; unceasing, continual; constant, persevering


dí-

dí- (mutation mutation-radical)
dhí- (lenition mutation)
ndí- (eclipsis mutation)


meán-

meán- (mutation mutation-radical)
mheán- (lenition mutation)


trí-

From trí (“three”) (compare Manx tree-).


frith-

frith- (mutation mutation-radical)
fhrith- (lenition mutation)
bhfrith- (eclipsis mutation)

From Old Irish frith- (“counter-, beside, against”), from the verbal nouns of Old Irish verbs like fris·beir, fris·aicci, fris·indlea with the initial preverb fri, from Proto-Celtic *writ- (compare Welsh wrth, prefix gwrth-), from the zero grade of Proto-Indo-European *wert- (“to turn”) (compare Latin versus (“against”)).


acra-

acra- (mutation mutation-radical)
n-acra- (eclipsis mutation)
hacra- (mutation prothesis-h)
t-acra- (mutation prothesis-t)

From Ancient Greek ἄκρος (ákros, “highest, at the extremity”).


mona-

mona- (mutation mutation-radical)
mhona- (lenition mutation)

From Ancient Greek μόνος (mónos, “alone, only, sole, single”).


bith-

From Old Irish bith-, from bith (“world, existence”).

bioth-

before a broad vowel or consonant other than T


bith-

bith- (mutation mutation-radical)
bhith- (lenition mutation)
mbith- (eclipsis mutation)

(biology) Combining form of beatha (“life”): bio-


t-

an t-athair

an tAthair

an tseachtain

an tSín

Marker of lenition of s after the definite article


idir-

idir- (mutation mutation-radical)
n-idir- (eclipsis mutation)
hidir- (mutation prothesis-h)
t-idir- (mutation prothesis-t)


ain-

ain- (mutation mutation-radical)
n-ain- (eclipsis mutation)
hain- (mutation prothesis-h)
t-ain- (mutation prothesis-t)


mion-

mion- (mutation mutation-radical)
mhion- (lenition mutation)

From mion (“small, tiny, fine, detailed”).


bar-

bar- (mutation mutation-radical)
bhar- (lenition mutation)
mbar- (eclipsis mutation)


daon-

daon- (mutation mutation-radical)
dhaon- (lenition mutation)
ndaon- (eclipsis mutation)

From daon, daonna, from Middle Irish dóen, a synonym of duine (“person”).


páirt-

páirt- (mutation mutation-radical)
pháirt- (lenition mutation)
bpáirt- (eclipsis mutation)


síci-

síci- (mutation mutation-radical)
shíci- (lenition mutation)
tsíci- (lenition mutation)

From Ancient Greek ψυχή (psukhḗ, “soul”).


fíli-

fíli- (mutation mutation-radical)
fhíli- (lenition mutation)
bhfíli- (eclipsis mutation)


antrapa-

antrapa- (mutation mutation-radical)
n-antrapa- (eclipsis mutation)
hantrapa- (mutation prothesis-h)

From Ancient Greek ἄνθρωπος (ánthrōpos, “man, human”).


hipi-

Borrowed from Ancient Greek ὑπό (hupó, “underneath”).


andra-

andra- (mutation mutation-radical)
n-andra- (eclipsis mutation)
handra- (mutation prothesis-h)

From Ancient Greek ἀνδρός (andrós), genitive of ἀνήρ (anḗr, “man, husband”).


pola-

From Ancient Greek πολύς (polús, “many, much”), from Proto-Indo-European *polh₁ús (“much, many”).


amfa-

amfa- (mutation mutation-radical)
n-amfa- (eclipsis mutation)
hamfa- (mutation prothesis-h)
t-amfa- (mutation prothesis-t)

From Ancient Greek ἀμφί (amphí, “on both sides”).


artra-

artra- (mutation mutation-radical)
n-artra- (eclipsis mutation)
hartra- (mutation prothesis-h)
t-artra- (mutation prothesis-t)

From Ancient Greek ἄρθρον (árthron, “a joint”).


hipir-

Borrowed from Ancient Greek ὑπέρ (hupér, “over”).


cíti-

cíti- (mutation mutation-radical)
chíti- (lenition mutation)
gcíti- (eclipsis mutation)

From Ancient Greek κύτος (kútos, “container, receptacle”).


pata-

pata- (mutation mutation-radical)
phata- (lenition mutation)
bpata- (eclipsis mutation)


carcana-

carcana- (mutation mutation-radical)
charcana- (lenition mutation)
gcarcana- (eclipsis mutation)


oll-

oll- (mutation mutation-radical)
n-oll- (eclipsis mutation)
holl- (mutation prothesis-h)
t-oll- (mutation prothesis-t)

From oll (“great; huge, vast, immense”).


onta-

onta- (mutation mutation-radical)
n-onta- (eclipsis mutation)
honta- (mutation prothesis-h)
t-onta- (mutation prothesis-t)


aera-

aera- (mutation mutation-radical)
n-aera- (eclipsis mutation)
haera- (mutation prothesis-h)
t-aera- (mutation prothesis-t)


tromba-

tromba- (mutation mutation-radical)
thromba- (lenition mutation)
dtromba- (eclipsis mutation)

From trombas (“thrombus”), from Ancient Greek θρόμβος (thrómbos, “lump”).


sean-

sean- (mutation mutation-radical)
shean- (lenition mutation)
tsean- (lenition mutation)

old, aged; senior; mature; long-established, old-fashioned; (of calendar) old style


oisté-

oisté- (mutation mutation-radical)
n-oisté- (eclipsis mutation)
hoisté- (mutation prothesis-h)
t-oisté- (mutation prothesis-t)


soch-

soch- (mutation mutation-radical)
shoch- (lenition mutation)
tsoch- (lenition mutation)

soch- + -patach (“-pathic”) → sochapatach (“sociopathic”)

soch- + cultúrtha (“cultural”) → soch-chultúrtha (“sociocultural”)


dios-

dios- (mutation mutation-radical)
dhios- (lenition mutation)
ndios- (eclipsis mutation)

From New Latin dys-, from Ancient Greek δυσ- (dus-).


mór-

mór- (mutation mutation-radical)
mhór- (lenition mutation)


micri-

micri- (mutation mutation-radical)
mhicri- (lenition mutation)


cítea-

cítea- (mutation mutation-radical)
chítea- (lenition mutation)
gcítea- (eclipsis mutation)


blasta-

blasta- (mutation mutation-radical)
bhlasta- (lenition mutation)
mblasta- (eclipsis mutation)

From Ancient Greek βλαστός (blastós, “a germ, bud, sprout, shoot”), from βλαστάνειν (blastánein, “to bud, sprout, grow”).


ard-

ard- (mutation mutation-radical)
n-ard- (eclipsis mutation)
hard- (mutation prothesis-h)
t-ard- (mutation prothesis-t)

aird-

used before slender consonants and vowels


eip-

eip- (mutation mutation-radical)
n-eip- (eclipsis mutation)
heip- (mutation prothesis-h)
t-eip- (mutation prothesis-t)


eipea-

eipea- (mutation mutation-radical)
n-eipea- (eclipsis mutation)
heipea- (mutation prothesis-h)
t-eipea- (mutation prothesis-t)


eipi-

eipi- (mutation mutation-radical)
n-eipi- (eclipsis mutation)
heipi- (mutation prothesis-h)
t-eipi- (mutation prothesis-t)


tais-

tais- (mutation mutation-radical)
thais- (lenition mutation)
dtais- (eclipsis mutation)


eo-

eo- (mutation mutation-radical)
n-eo- (eclipsis mutation)
heo- (mutation prothesis-h)

From Ancient Greek εὖ (eû, “well”), from Proto-Indo-European *h₁su-. Doublet of so-.


eisi-

eisi- (mutation mutation-radical)
n-eisi- (eclipsis mutation)
heisi- (mutation prothesis-h)
t-eisi- (mutation prothesis-t)


lacht-

From lacht (“milk yield”) or Latin lac, lactis (“milk”).


tírea-

tírea- (mutation mutation-radical)
thírea- (lenition mutation)
dtírea- (eclipsis mutation)


tíri-

tíri- (mutation mutation-radical)
thíri- (lenition mutation)
dtíri- (eclipsis mutation)


iada-

iada- (mutation mutation-radical)
n-iada- (eclipsis mutation)
hiada- (mutation prothesis-h)
t-iada- (mutation prothesis-t)


gnáth-

gnáth- (mutation mutation-radical)
ghnáth- (lenition mutation)
ngnáth- (eclipsis mutation)


neas-

From neasa (“nearer, nearest”); compare neas (“near, close”).


teirmi-

teirmi- (mutation mutation-radical)
theirmi- (lenition mutation)
dteirmi- (eclipsis mutation)

From Ancient Greek θερμός (thermós, “warm, hot”).


alla-

alla- (mutation mutation-radical)
n-alla- (eclipsis mutation)
halla- (mutation prothesis-h)

From Ancient Greek ἄλλος (állos, “other”).


isi-

isi- (mutation mutation-radical)
n-isi- (eclipsis mutation)
hisi- (mutation prothesis-h)

Borrowed from Ancient Greek ἴσος (ísos, “equal”).


bata-

bata- (mutation mutation-radical)
bhata- (lenition mutation)
mbata- (eclipsis mutation)


histi-

From Ancient Greek ἱστός (histós, “web, tissue”).


hola-

From Ancient Greek ὅλος (hólos, “whole”).


heipti-

From Ancient Greek ἑπτά (heptá, “seven”).


seacht-

seacht- (mutation mutation-radical)
sheacht- (lenition mutation)
tseacht- (lenition mutation)


tré-

From Middle Irish [Term?], from Old Irish tre-, from Proto-Celtic *trei.


réamh-

Old Irish remi-, from Proto-Celtic *ɸrīsamos, superlative of *ɸrīs (“before”). Cognate with Latin primus.


dú-

dú- (mutation mutation-radical)
dhú- (lenition mutation)
ndú- (eclipsis mutation)


eitni-

eitni- (mutation mutation-radical)
n-eitni- (eclipsis mutation)
heitni- (mutation prothesis-h)
t-eitni- (mutation prothesis-t)


bibli-

bibli- (mutation mutation-radical)
bhibli- (lenition mutation)
mbibli- (eclipsis mutation)

From Ancient Greek βιβλίον (biblíon, “small book”).


éici-

éici- (mutation mutation-radical)
n-éici- (eclipsis mutation)
héici- (mutation prothesis-h)
t-éici- (mutation prothesis-t)

From Ancient Greek οἶκος (oîkos, “house, household”).


cróna-

cróna- (mutation mutation-radical)
chróna- (lenition mutation)
gcróna- (eclipsis mutation)


cluas-

cluas- (mutation mutation-radical)
chluas- (lenition mutation)
gcluas- (eclipsis mutation)


achtana-

achtana- (mutation mutation-radical)
n-achtana- (eclipsis mutation)
hachtana- (mutation prothesis-h)
t-achtana- (mutation prothesis-t)

From Ancient Greek ἀκτῑ́ς (aktī́s, “ray, beam”).


clos-

clos- (mutation mutation-radical)
chlos- (lenition mutation)
gclos- (eclipsis mutation)

From Old Irish clos (“hearing”) (compare cluas (“ear”), clois (“hear”)).


deindri-

deindri- (mutation mutation-radical)
dheindri- (lenition mutation)
ndeindri- (eclipsis mutation)


morfa-

morfa- (mutation mutation-radical)
mhorfa- (lenition mutation)

From Ancient Greek μορφή (morphḗ, “form”).


pailé-

pailé- (mutation mutation-radical)
phailé- (lenition mutation)
bpailé- (eclipsis mutation)

From Ancient Greek παλαιός (palaiós, “old”).


oftailmi-

oftailmi- (mutation mutation-radical)
n-oftailmi- (eclipsis mutation)
hoftailmi- (mutation prothesis-h)
t-oftailmi- (mutation prothesis-t)

From Ancient Greek ὀφθαλμός (ophthalmós, “eye”).


zó-

From Ancient Greek ζῷον (zôion, “animal”).

zó- + eolaíocht (“science”) → zó-eolaíocht (“zoology”)

zó- + planctón (“plankton”) → zóplanctón (“zooplankton”)

zó- + spór (“spore”) → zóspór (“zoospore”)


macra-

macra- (mutation mutation-radical)
mhacra- (lenition mutation)

From Ancient Greek μακρός (makrós, “long”), from Proto-Indo-European *mh₂ḱrós.


liti-

From Ancient Greek λῐ́θος (líthos, “stone”).


neifri-

From Ancient Greek νεφρός (nephrós, “kidney”).

(medicine) nephro-, nephric, of or relating to kidneys


ceirbri-

ceirbri- (mutation mutation-radical)
cheirbri- (lenition mutation)
gceirbri- (eclipsis mutation)


ódónta-

ódónta- (mutation mutation-radical)
n-ódónta- (eclipsis mutation)
hódónta- (mutation prothesis-h)

From Ancient Greek ὀδούς, ὀδόντος (odoús, odóntos, “tooth”).

ὀδούς, ὀδόντος


grian-

grian- (mutation mutation-radical)
ghrian- (lenition mutation)
ngrian- (eclipsis mutation)


bruth-

bruth- (mutation mutation-radical)
bhruth- (lenition mutation)
mbruth- (eclipsis mutation)


ion-

ion- (mutation mutation-radical)
n-ion- (eclipsis mutation)
hion- (mutation prothesis-h)
t-ion- (mutation prothesis-t)


uas-

uas- (mutation mutation-radical)
n-uas- (eclipsis mutation)
huas- (mutation prothesis-h)
t-uas- (mutation prothesis-t)


cros-

cros- (mutation mutation-radical)
chros- (lenition mutation)
gcros- (eclipsis mutation)


fisici-

fisici- (mutation mutation-radical)
fhisici- (lenition mutation)
bhfisici- (eclipsis mutation)


sain-

sain- (mutation mutation-radical)
shain- (lenition mutation)
tsain- (lenition mutation)

From Old Irish sain (“different, distinct, separate; peculiar, special”).

inh

special, particular, specific, characteristic


dearbh-

dearbh- (mutation mutation-radical)
dhearbh- (lenition mutation)
ndearbh- (eclipsis mutation)

From Old Irish derb-, from derb (“sure, certain, fixed, determinate”).


aith-

aith- (mutation mutation-radical)
n-aith- (eclipsis mutation)
haith- (mutation prothesis-h)
t-aith- (mutation prothesis-t)

slender form of ath- (“re-, second; old, rejected, ex-; return; later, after”)


anga-

anga- (mutation mutation-radical)
n-anga- (eclipsis mutation)
hanga- (mutation prothesis-h)
t-anga- (mutation prothesis-t)

From Ancient Greek ἀγγεῖον (angeîon, “vessel, urn, pot”).


eas-

From Old Irish ess-, from Proto-Celtic *exs-, prefixed form of *exs, from Proto-Indo-European *eǵʰs.


eachtar-

eachtar- (mutation mutation-radical)
n-eachtar- (eclipsis mutation)
heachtar- (mutation prothesis-h)
t-eachtar- (mutation prothesis-t)

From Proto-Indo-European *h₁eǵʰs-tero-, from *h₁eǵʰs.


fíci-

fíci- (mutation mutation-radical)
fhíci- (lenition mutation)
bhfíci- (eclipsis mutation)


cripti-

cripti- (mutation mutation-radical)
chripti- (lenition mutation)
gcripti- (eclipsis mutation)

From Ancient Greek κρυπτός (kruptós, “hidden, secret”).


crómata-

crómata- (mutation mutation-radical)
chrómata- (lenition mutation)
gcrómata- (eclipsis mutation)

From Ancient Greek χρῶμα, χρώματος (khrôma, khrṓmatos, “color”).

χρῶμα, χρώματος


gar-

gar- (mutation mutation-radical)
ghar- (lenition mutation)
ngar- (eclipsis mutation)


barr-

barr- (mutation mutation-radical)
bharr- (lenition mutation)
mbarr- (eclipsis mutation)


buan-

buan- (mutation mutation-radical)
bhuan- (lenition mutation)
mbuan- (eclipsis mutation)

From buan (“enduring, permanent; steadfast, solid”).


bili-

bili- (mutation mutation-radical)
bhili- (lenition mutation)
mbili- (eclipsis mutation)


fís-

fís- (mutation mutation-radical)
fhís- (lenition mutation)
bhfís- (eclipsis mutation)


teili-

teili- (mutation mutation-radical)
theili- (lenition mutation)
dteili- (eclipsis mutation)

From Ancient Greek τῆλε (têle, “at a distance, far off, far away, far from”).


cúl-

cúl- (mutation mutation-radical)
chúl- (lenition mutation)
gcúl- (eclipsis mutation)


artr-

artr- (mutation mutation-radical)
n-artr- (eclipsis mutation)
hartr- (mutation prothesis-h)
t-artr- (mutation prothesis-t)

Alternative form of artra-, used before a vowel.


fosfa-

fosfa- (mutation mutation-radical)
fhosfa- (lenition mutation)
bhfosfa- (eclipsis mutation)


bog-

bog- (mutation mutation-radical)
bhog- (lenition mutation)
mbog- (eclipsis mutation)


sár-

sár- (mutation mutation-radical)
shár- (lenition mutation)
tsár- (lenition mutation)

From Old Irish sár (“exceeding, excellent, very”), from sár m (“outrage, insult, humiliation, discomfiture, defeat; act of excelling, exceeding; that which excels, exceeds”).

inh

exceeding, surpassing; excellent; ultra-, super-, most


crág-

crág- (mutation mutation-radical)
chrág- (lenition mutation)
gcrág- (eclipsis mutation)


gearr-

gearr- (mutation mutation-radical)
ghearr- (lenition mutation)
ngearr- (eclipsis mutation)

gearr- + maith → gearrmhaith (“pretty good”)


deá-

deá- (mutation mutation-radical)
dheá- (lenition mutation)
ndeá- (eclipsis mutation)


fíor-

fíor- (mutation mutation-radical)
fhíor- (lenition mutation)
bhfíor- (eclipsis mutation)


acanta-

acanta- (mutation mutation-radical)
n-acanta- (eclipsis mutation)
hacanta- (mutation prothesis-h)
t-acanta- (mutation prothesis-t)

From New Latin acanthus, from Ancient Greek ἄκανθος (ákanthos, “thorn plant”), from ἄκανθα (ákantha, “thorn”).


adana-

adana- (mutation mutation-radical)
n-adana- (eclipsis mutation)
hadana- (mutation prothesis-h)
t-adana- (mutation prothesis-t)

From Ancient Greek ἀδήν (adḗn, “gland”).


apa-

apa- (mutation mutation-radical)
n-apa- (eclipsis mutation)
hapa- (mutation prothesis-h)
t-apa- (mutation prothesis-t)

From Ancient Greek ἀπό- (apó-), from ἀπό (apó, “from, away from”, preposition), from Proto-Indo-European *h₂epo (“off, away”).


aird-

aird- (mutation mutation-radical)
n-aird- (eclipsis mutation)
haird- (mutation prothesis-h)
t-aird- (mutation prothesis-t)

slender form of ard- (“high; arch-, chief; excellent, noble; advanced”)


ais-

ais- (mutation mutation-radical)
n-ais- (eclipsis mutation)
hais- (mutation prothesis-h)
t-ais- (mutation prothesis-t)


ata-

ata- (mutation mutation-radical)
n-ata- (eclipsis mutation)
hata- (mutation prothesis-h)


alda-

alda- (mutation mutation-radical)
n-alda- (eclipsis mutation)
halda- (mutation prothesis-h)
t-alda- (mutation prothesis-t)


asca-

asca- (mutation mutation-radical)
n-asca- (eclipsis mutation)
hasca- (mutation prothesis-h)
t-asca- (mutation prothesis-t)


afana-

afana- (mutation mutation-radical)
n-afana- (eclipsis mutation)
hafana- (mutation prothesis-h)
t-afana- (mutation prothesis-t)

From Ancient Greek ἀφανής (aphanḗs, “unseen”).


anta-

anta- (mutation mutation-radical)
n-anta- (eclipsis mutation)
hanta- (mutation prothesis-h)

From Ancient Greek ἀντί (antí, “against”).


carba-

carba- (mutation mutation-radical)
charba- (lenition mutation)
gcarba- (eclipsis mutation)


aidréinea-

aidréinea- (mutation mutation-radical)
n-aidréinea- (eclipsis mutation)
haidréinea- (mutation prothesis-h)
t-aidréinea- (mutation prothesis-t)

Alternative form of aidréini- (“adreno-”)


aidréini-

aidréini- (mutation mutation-radical)
n-aidréini- (eclipsis mutation)
haidréini- (mutation prothesis-h)
t-aidréini- (mutation prothesis-t)


amala-

amala- (mutation mutation-radical)
n-amala- (eclipsis mutation)
hamala- (mutation prothesis-h)
t-amala- (mutation prothesis-t)


fia-

fia- (mutation mutation-radical)
fhia- (lenition mutation)
bhfia- (eclipsis mutation)


bronca-

bronca- (mutation mutation-radical)
bhronca- (lenition mutation)
mbronca- (eclipsis mutation)


histea-

Alternative form of histi- used before broad (velarised) consonants.


xéiri-

From Ancient Greek ξηρός (xērós, “dry”).


xéirea-

Alternative form of xéiri- (used before a broad consonant)


xéar-

Alternative form of xéiri- (used before a broad vowel)


acr-

acr- (mutation mutation-radical)
n-acr- (eclipsis mutation)
hacr- (mutation prothesis-h)
t-acr- (mutation prothesis-t)

Alternative form of acra-, used before a vowel.


méisi-

méisi- (mutation mutation-radical)
mhéisi- (lenition mutation)

From Ancient Greek μέσος (mésos, “middle”).


aircéi-

aircéi- (mutation mutation-radical)
n-aircéi- (eclipsis mutation)
haircéi- (mutation prothesis-h)
t-aircéi- (mutation prothesis-t)


aircéa-

aircéa- (mutation mutation-radical)
n-aircéa- (eclipsis mutation)
haircéa- (mutation prothesis-h)
t-aircéa- (mutation prothesis-t)

Alternative form of aircéi- (“archaeo-”)


breac-

breac- (mutation mutation-radical)
bhreac- (lenition mutation)
mbreac- (eclipsis mutation)

From breac (“speckled, dappled”, adjective).


aicéiti-

aicéiti- (mutation mutation-radical)
n-aicéiti- (eclipsis mutation)
haicéiti- (mutation prothesis-h)
t-aicéiti- (mutation prothesis-t)


pleorai-

Alternative form of pleora- used before slender (palatalised) consonants.


artrai-

artrai- (mutation mutation-radical)
n-artrai- (eclipsis mutation)
hartrai- (mutation prothesis-h)
t-artrai- (mutation prothesis-t)

Alternative form of artra-, used before a slender consonant.


pleora-

pleora- (mutation mutation-radical)
phleora- (lenition mutation)
bpleora- (eclipsis mutation)


basai-

basai- (mutation mutation-radical)
bhasai- (lenition mutation)
mbasai- (eclipsis mutation)

Alternative form of basa- (“basi-, baso-”)


aerai-

aerai- (mutation mutation-radical)
n-aerai- (eclipsis mutation)
haerai- (mutation prothesis-h)
t-aerai- (mutation prothesis-t)

Alternative form of aera- (“aero-, aerial; pneumatic”)


blastai-

blastai- (mutation mutation-radical)
bhlastai- (lenition mutation)
mblastai- (eclipsis mutation)

Alternative form of blasta- (“blasto-”), used before a slender consonant.


bronc-

bronc- (mutation mutation-radical)
bhronc- (lenition mutation)
mbronc- (eclipsis mutation)

Alternative form of bronca- (“broncho-”)


broncai-

broncai- (mutation mutation-radical)
bhroncai- (lenition mutation)
mbroncai- (eclipsis mutation)


barai-

barai- (mutation mutation-radical)
bharai- (lenition mutation)
mbarai- (eclipsis mutation)


bara-

bara- (mutation mutation-radical)
bhara- (lenition mutation)
mbara- (eclipsis mutation)

From Ancient Greek βάρος (báros, “weight”), from βαρύς (barús, “heavy”).


basa-

basa- (mutation mutation-radical)
bhasa- (lenition mutation)
mbasa- (eclipsis mutation)

From Latin basis, from Ancient Greek βάσις (básis, “foundation, base”).


baictéarai-

baictéarai- (mutation mutation-radical)
bhaictéarai- (lenition mutation)
mbaictéarai- (eclipsis mutation)

slender form of baictéara- (“bacterio-”)


ainéimea-

ainéimea- (mutation mutation-radical)
n-ainéimea- (eclipsis mutation)
hainéimea- (mutation prothesis-h)
t-ainéimea- (mutation prothesis-t)

Alternative form of ainéimi- (“anem(o)-”), used before broad consonants.


ainéimi-

ainéimi- (mutation mutation-radical)
n-ainéimi- (eclipsis mutation)
hainéimi- (mutation prothesis-h)
t-ainéimi- (mutation prothesis-t)

From Ancient Greek ἄνεμος (ánemos, “wind”).


baictéara-

baictéara- (mutation mutation-radical)
bhaictéara- (lenition mutation)
mbaictéara- (eclipsis mutation)


bairr-

bairr- (mutation mutation-radical)
bhairr- (lenition mutation)
mbairr- (eclipsis mutation)


asó-

asó- (mutation mutation-radical)
n-asó- (eclipsis mutation)
hasó- (mutation prothesis-h)
t-asó- (mutation prothesis-t)

From Ancient Greek ἀ- (a-, “without”) + ζωή (zōḗ, “life”).


teirmea-

teirmea- (mutation mutation-radical)
theirmea- (lenition mutation)
dteirmea- (eclipsis mutation)


teirm-

teirm- (mutation mutation-radical)
theirm- (lenition mutation)
dteirm- (eclipsis mutation)


batai-

batai- (mutation mutation-radical)
bhatai- (lenition mutation)
mbatai- (eclipsis mutation)

slender form of bata- (“batho-; bathy-”)


bilea-

bilea- (mutation mutation-radical)
bhilea- (lenition mutation)
mbilea- (eclipsis mutation)

Alternative form of bili- (“bili-”), used before a broad consonant.


baisidi-

baisidi- (mutation mutation-radical)
bhaisidi- (lenition mutation)
mbaisidi- (eclipsis mutation)


beag-

beag- (mutation mutation-radical)
bheag- (lenition mutation)
mbeag- (eclipsis mutation)

From beag (“little, small; few”, adjective).

beag- + méid (“amount, quantity, extent, degree, number”) → beagmhéid (“smallness”)

beag- + cúiteamh (“recompense, compensation”) → beagchúiteamh (“thanklessness”)

beag- + cainteach (“talkative; chatty”) → beagchainteach (“silent, taciturn”)

beag- + eaglach (“fearful, afraid; apprehensive, timid”) → beageaglach (“fearless”)


baisidea-

baisidea- (mutation mutation-radical)
bhaisidea- (lenition mutation)
mbaisidea- (eclipsis mutation)


corr-

head

corr- (triggers lenition of a following consonant)

of a following consonant (triggers-lenition)
corr- (mutation mutation-radical)
chorr- (lenition mutation)
gcorr- (eclipsis mutation)

corr-áit

corr-uair

corr-dhuine


claon-

claon- (mutation mutation-radical)
chlaon- (lenition mutation)
gclaon- (eclipsis mutation)

From Old Irish cláen (“uneven, crooked, sloping”).

claonfhód

sloping sod; sod turned against slope of hill


meath-

meath- (mutation mutation-radical)
mheath- (lenition mutation)


antó-

antó- (mutation mutation-radical)
n-antó- (eclipsis mutation)
hantó- (mutation prothesis-h)
t-antó- (mutation prothesis-t)

From Ancient Greek ἄνθος (ánthos, “flower”).


zói-

Alternative form of zó- (“zoo-”) (used before a slender consonant)


pliúrai-

Alternative form of pliúra- used before slender (palatalised) consonants.


achtan-

achtan- (mutation mutation-radical)
n-achtan- (eclipsis mutation)
hachtan- (mutation prothesis-h)
t-achtan- (mutation prothesis-t)

Alternative form of achtana-, used before a vowel.


achtanai-

achtanai- (mutation mutation-radical)
n-achtanai- (eclipsis mutation)
hachtanai- (mutation prothesis-h)
t-achtanai- (mutation prothesis-t)

Alternative form of achtana-, used before a slender consonant.


acant-

acant- (mutation mutation-radical)
n-acant- (eclipsis mutation)
hacant- (mutation prothesis-h)
t-acant- (mutation prothesis-t)

Alternative form of acanta-, used before a vowel.


adanai-

adanai- (mutation mutation-radical)
n-adanai- (eclipsis mutation)
hadanai- (mutation prothesis-h)
t-adanai- (mutation prothesis-t)

Alternative form of adana-, used before a slender consonant.


afanai-

afanai- (mutation mutation-radical)
n-afanai- (eclipsis mutation)
hafanai- (mutation prothesis-h)
t-afanai- (mutation prothesis-t)

Alternative form of afana-, used before a slender consonant.


afan-

afan- (mutation mutation-radical)
n-afan- (eclipsis mutation)
hafan- (mutation prothesis-h)
t-afan- (mutation prothesis-t)

Alternative form of afana-, used before a vowel.


acantai-

acantai- (mutation mutation-radical)
n-acantai- (eclipsis mutation)
hacantai- (mutation prothesis-h)
t-acantai- (mutation prothesis-t)

Alternative form of acanta-, used before a slender consonant.


adan-

adan- (mutation mutation-radical)
n-adan- (eclipsis mutation)
hadan- (mutation prothesis-h)
t-adan- (mutation prothesis-t)

Alternative form of adana-, used before a vowel.


acrai-

acrai- (mutation mutation-radical)
n-acrai- (eclipsis mutation)
hacrai- (mutation prothesis-h)
t-acrai- (mutation prothesis-t)

Alternative form of acra-, used before a slender consonant.


aldai-

aldai- (mutation mutation-radical)
n-aldai- (eclipsis mutation)
haldai- (mutation prothesis-h)
t-aldai- (mutation prothesis-t)

Alternative form of alda-, used before a slender consonant.


ald-

ald- (mutation mutation-radical)
n-ald- (eclipsis mutation)
hald- (mutation prothesis-h)
t-ald- (mutation prothesis-t)

Alternative form of alda-, used before a vowel.


apai-

apai- (mutation mutation-radical)
n-apai- (eclipsis mutation)
hapai- (mutation prothesis-h)
t-apai- (mutation prothesis-t)

Alternative form of apa-, used before a slender consonant.


amfai-

amfai- (mutation mutation-radical)
n-amfai- (eclipsis mutation)
hamfai- (mutation prothesis-h)
t-amfai- (mutation prothesis-t)

Alternative form of amfa-, used before a slender consonant.


bioth-

bioth- (mutation mutation-radical)
bhioth- (lenition mutation)
mbioth- (eclipsis mutation)

Alternative form of bith-, used before a broad vowel or consonant other than T.


leictrea-

Alternative form of leictri- (“electro-”), used before a broad consonant.


leictr-

Alternative form of leictri- (“electro-”), used before a vowel.


Gréag-

Gréag- (mutation mutation-radical)
Ghréag- (lenition mutation)
nGréag- (eclipsis mutation)


beath-

beath- (mutation mutation-radical)
bheath- (lenition mutation)
mbeath- (eclipsis mutation)


donn-

donn- (mutation mutation-radical)
dhonn- (lenition mutation)
ndonn- (eclipsis mutation)


Sín-

Sín- (mutation mutation-radical)
Shín- (lenition mutation)
tSín- (lenition mutation)


ódóntai-

ódóntai- (mutation mutation-radical)
n-ódóntai- (eclipsis mutation)
hódóntai- (mutation prothesis-h)
t-ódóntai- (mutation prothesis-t)

Alternative form of ódónta-, used before a slender consonant.


éicea-

éicea- (mutation mutation-radical)
n-éicea- (eclipsis mutation)
héicea- (mutation prothesis-h)
t-éicea- (mutation prothesis-t)

From Ancient Greek οἶκος (oîkos, “house, household”).


úiréi-

úiréi- (mutation mutation-radical)
n-úiréi- (eclipsis mutation)
húiréi- (mutation prothesis-h)
t-úiréi- (mutation prothesis-t)

From úiré (“urea”), from French urée, from Ancient Greek οὖρον (oûron, “urine”).


úiréa-

úiréa- (mutation mutation-radical)
n-úiréa- (eclipsis mutation)
húiréa- (mutation prothesis-h)
t-úiréa- (mutation prothesis-t)


gastrai-

Alternative form of gastra-, used before a slender consonant.


gastra-

gastra- (mutation mutation-radical)
ghastra- (lenition mutation)
ngastra- (eclipsis mutation)

Coined based on Ancient Greek γαστήρ (gastḗr, “stomach”).


flóra-

flóra- (mutation mutation-radical)
fhlóra- (lenition mutation)
bhflóra- (eclipsis mutation)


haema-

From Ancient Greek αἱμο- (haimo-), akin to αἷμα (haîma, “blood”).


glas-

From glas (“green, grey; immature, unseasoned; raw, inexperienced; pale, sickly-hued”).


glas-

glas- (mutation mutation-radical)
ghlas- (lenition mutation)
nglas- (eclipsis mutation)

glasoileán

peninsula; island accessible by bridge or on foot at low tide


Angla-

Angla- (mutation mutation-radical)
nAngla- (eclipsis mutation)
hAngla- (mutation prothesis-h)
tAngla- (mutation prothesis-t)


leocai-

Alternative form of leoca-, used before a slender consonant.


leoca-

From Ancient Greek λευκός (leukós, “white”).


cinn-

cinn- (mutation mutation-radical)
chinn- (lenition mutation)
gcinn- (eclipsis mutation)

Alternative form of ceann- (“chief, main; -headed”), used before slender consonants


cailc-

cailc- (mutation mutation-radical)
chailc- (lenition mutation)
gcailc- (eclipsis mutation)


tsean-

Lenited form of sean- (after an and, in some dialects, after any l or n).


ceimi-

ceimi- (mutation mutation-radical)
cheimi- (lenition mutation)
gceimi- (eclipsis mutation)


súid-

From English pseudo-, from Ancient Greek ψευδής (pseudḗs, “false, lying”).


teicni-

From Ancient Greek τέχνη (tékhnē, “skill”).


ainisi-

From Ancient Greek ἄνισος (ánisos, “unequal”).


peitri-

From Latin petra (“stone, rock”), from Ancient Greek πέτρα (pétra, “stone, rock”).


dún-

Lengthened from Middle Irish dun-, combining form of duine before a broad consonant.

dún- + bású (“killing”) → dúnbhású (“homicide”)

dún- + marú (“killing”) → dúnmharú (“murder”)

dún- + argain (“destruction”) → dúnorgain (“manslaughter”)

dún- + poll (“hole”) → dúnpholl (“manhole”)

Combining form of duine (“human, person”)


las-

Contracted from leath is (“the side that is”)

prefixed to adverbs of stationary location to indicate location on the side indicated