Charon

(Greek mythology) Charon (the ferryman of the underworld)


Mawrth

From Middle Welsh Mawrth, from Proto-Brythonic *Mo̦rθ, borrowed from Latin mārtius. Compare Cornish Merth, Breton Meurzh.


Ganymede

Borrowed from English Ganymede, from French Ganymède, from Latin Ganymēdēs, from Ancient Greek Γανυμήδης (Ganumḗdēs).

(Greek mythology, Roman mythology) Ganymede (lover of Jupiter/Zeus)


Tethys

Borrowed from English Tethys, from Ancient Greek Τηθύς (Tēthús).


Io

Borrowed from English Io, from Latin Iō, from Ancient Greek Ἰώ (Iṓ).

(Greek mythology, Roman mythology) Io (lover of Jupiter/Zeus)


Rhea

Borrowed from English Rhea, from Ancient Greek Ῥέα (Rhéa).


Phobos

Borrowed from English Phobos, from Ancient Greek Φόβος (Phóbos).

(Roman mythology, Greek Mythology) Phobos (son of Mars/Ares)


Deimos

Borrowed from English Deimos, from Ancient Greek Δεῖμος (Deîmos).

(Roman mythology, Greek Mythology) Deimos (son of Mars/Ares)


Callisto

Borrowed from English Callisto from Latin Callistō, from Ancient Greek Καλλιστώ (Kallistṓ).

(Greek mythology) Callisto (nymph of Artemis)


Dysnomia

(Greek mythology) Dysnomia (Daughter of Eris)


Enid

(mythology) Enid, the long-suffering wife of Geraint in Arthurian romance.


Dione

Borrowed from English Dione, from Latin Diōnē (“of Jupiter”), from Ancient Greek Διώνη (Diṓnē, “of Zeus”).

(Greek mythology) Dione (the mother of Aphrodite)


Mimas

Borrowed from English Mimas, from Ancient Greek Μίμᾱς (Mímās).


afanc

afancod (plural)
afanc
hafanc (prothesis-h)
addanc (alternative)

From Proto-Brythonic *aβank, from Proto-Celtic *abankos (compare Breton avank, Irish abhac (“dwarf”)), from *abū (“river”). More at afon.

(Celtic mythology, mythology) afanc (lake monster in Welsh mythology)


Ewropa

Borrowed from English Europa, from Latin Eurōpa, from Ancient Greek Εὐρώπα (Eurṓpa) a Doric variant of Εὐρώπη (Eurṓpē). Doublet of Ewrop.

(Greek mythology) Europa (several characters, most notably a Phoenician princess abducted to Crete by Zeus)


Iau

Iau
Hiau (prothesis-h)
Iou (alternative)

From Middle Welsh Ieu, from Proto-Brythonic *Yow, from Latin Iovem (accusative of Iuppiter), from Proto-Indo-European *dyew- (“sky”). Compare Breton Yaou, Cornish Yow.

der

accusative of <i class="Latn mention" lang="la">Iuppiter</i>


Sadwrn

From Middle Welsh Sadwrn, from Proto-Brythonic *Sadurn, borrowed from Vulgar Latin Săturnus, from Latin Sāturnus. Compare Cornish and Breton Sadorn.


arwydd

arwyddion (plural)
arwydd
harwydd (prothesis-h)

From Middle Welsh arwyð, from Proto-Celtic *ɸareweidyom; compare Old Irish airde.

arwydd y Llew

(astrology, astronomy) sign (of the zodiac)


nymff

cy-noun

nymff f (plural nymffod or nimffau or nimffiaid, not mutable)

nymffod (plural)
nimffau (plural)
nimffiaid (plural)

Borrowed from Latin nympha (“nymph, bride”), from Ancient Greek νύμφη (númphē, “bride”).

(Greek mythology, Roman mythology) nymph


cysylltiad

cysylltiadau (plural)
cysylltiad
gysylltiad (soft)
nghysylltiad
chysylltiad

From cysylltu (“to join, connect”) + -iad.

(astrology, astronomy, grammar) conjunction


cyswllt

cyswllt m (plural cysylltau or cysylltiau)

From Middle Welsh kysswllt, from Proto-Brythonic *kusulld, from Vulgar Latin *cōnsoldus, cōnsolidus; cf. Latin cōnsolidō.

(astronomy, astrology, grammar) conjunction


isfyd

isfydoedd (plural)
isfyd
hisfyd (prothesis-h)

From is- (“under, lower”) + byd (“world”).


Wranws

Wranws
Hwranws (prothesis-h)
Iwranws (alternative)


tafol

tafolau (plural)
taflau (plural)
tafal (alternative)
tafl (alternative)
tafol
dafol (soft)
nhafol
thafol

From Middle Welsh taval, from Proto-Brythonic *taβol (compare Middle Breton taul, taoll and modern Breton taol), from Latin tabula. Doublet of tabl (“table”).


gwyllgi

gwyllgwn (plural)
gwyllgi
wyllgi (soft)
ngwyllgi

Either from gwyll (“twilight”) + ci (“dog”) or a variant form of gwylltgi from gwyllt (“wild”) and ci (“dog”).

Ymhlith atyniadau'r amgueddfa bydd storïwr yn adrodd hanes y Gwyllgi, un o gŵn du llên werin Cymru.

2012 August 12, “Amgueddfa werin dros dro yn Wrecsam”, in Cymru Fyw, BBC:

Among the museum's attractions will be a storyteller telling the history of the Gwyllgi, one of the black dogs of Welsh folklore.

(mythology) A hellhound from Welsh folklore, appearing as a large black mastiff.


annwn

annwn
hannwn (prothesis-h)
annwfn (alternative)

(mythology) underworld, netherworld, fairyland


Plwton

Internationalism. Borrowed from Latin Plūtō, Plūtōnem, possibly via Pluto.


Enceladws

Borrowed from English Enceladus, from Ancient Greek Ἐγκέλαδος (Enkélados).


Iapetws

Borrowed from English Iapetus, from Ancient Greek Ἰαπετός (Iapetós).


arwydd y sidydd

arwydd y sidydd m (plural arwyddion y sidydd)

arwyddion y sidydd (plural)
arwydd y sidydd
harwydd y sidydd (prothesis-h)


Caerdroea

Caerdroea
Gaerdroea (soft)
Nghaerdroea
Chaerdroea

From caer (“citadel, fortress”) + Latin Trōia.