a-

From the Ancient Greek ἀ- (a-, “not, without”).

Used to form taxonomic names indicating a lack of some feature that might be expected


pseudo-

(biology) Not a true, appearing like a true


CL

(aviation) the prefix for Canadair manufactured aircraft model numbers


mega-

From Ancient Greek μέγας (mégas, “great, large, mighty”).

der

Used with taxon names to form other taxon names, usually for a morphologically similar taxon differing only in size


micro-

From New Latin micro- (“small”), from Ancient Greek μικρός (mikrós, “small”).

micro- + Cebus → Microcebus


hexa-

From Latin hexa-, from Ancient Greek ἑξα- (hexa-), from ἕξ (héx, “six”).


neo-

From Ancient Greek νέος (néos, “new, young”).

new. (Often used to form clade or taxonomic names indicating more recent branching than a morphologically or otherwise similar group.)


xeno-

From Ancient Greek ξένος (xénos, “alien”).

Used to form taxonomic names and epithets indicating strangeness


hyper-

From Ancient Greek ὑπέρ (hupér, “over”).


neuro-

New Latin, from Ancient Greek νευρο- (neuro-), combining form of νεῦρον (neûron, “sinew, tendon, cord”)

nerves, nerve tissue, or the nervous system.


archi-

Late Latin archi- (“arch-, chief, first”), from Ancient Greek ἀρχι- (arkhi-, “chief, leading”), from ἄρχω (árkhō, “I begin, lead, rule, govern”)


S-

(chemistry) one of two mirror-image forms of a stereocentre, part of a diastereomer


acro-

classical compound
international scientific vocabulary

From international scientific vocabulary, reflecting a New Latin combining form, from New Latin acro- (“pointed, first, high”) (from Ancient Greek ἄκρος (ákros, “highest, at the extremity”)).


uro-

New Latin, from Ancient Greek οὐρά (ourá, “tail”)


meso-

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

(taxonomy, biology) intermediate in size or other characteristic.


AT

astronomical transient
astronomical transient#Translingual

(astronomy) Abbreviation of astronomical transient.; prefix for astronomical transients in official IAU astronomical event and object notation. The International Astronomical Union (IAU) is the official international arbiter of naming of astronomical objects and events in the field of astronomy.


gymno-

From Ancient Greek γυμνός (gumnós, “naked”).


chalco-

New Latin, from Ancient Greek χαλκός (khalkós, “copper”).

used to form taxonomic names, principally of genera


afro-

New Latin, from stem of Latin Afer (“African”), noun and adjective


lepto-

Borrowed from Ancient Greek λεπτός (leptós, “thin”).


pan-

Used to form higher clades with one main member.


da-

Coordinate term: d- (deci-)

(SI prefix, metrology) deca- (“×10¹”); Alternative form of dk- (“deka-”)


crypto-

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


eu-

New Latin, from Ancient Greek εὖ (eû, “well, good”)

Used to form taxonomic names corresponding to English vernacular names beginning with true


hypo-

From Ancient Greek ὑπο- (hupo-), combining form of ὑπό (hupó, “under”).


l-

(chemistry) deprecated notation for levorotatory (versus modern notation, (−)).


D-

From d-glyceraldehyde, old name of (+)-glyceraldehyde.

(chemistry) one of two mirror-image forms of an isomer (enantiomer) derived from (R)-glyceraldehyde. Written in small caps.


D-

From deca-/deka-. From French SI metric system origins. From Latin decas, from Ancient Greek δέκα (déka, “10”).

Coordinate term: d- (deci-)

(metrology) Nonstandard form of da- (“deca-”).


chir-

cheiro- (alternative)
chiro- (alternative)
cheir- (alternative)


L-

From l-glyceraldehyde, old name of (−)-glyceraldehyde.

(chemistry) one of two mirror-image forms of an isomer (enantiomer) derived from (S)-glyceraldehyde. Written in small caps.


cyno-

New Latin, from Ancient Greek κύων (kúōn, “dog”).

Used to form names for taxa whose members resemble dogs in some way


brachio-

New Latin brachio- from Latin bracchium (“limb, branch, arm”)


proteo-

Derived from New Latin Prōteus, from Ancient Greek Πρωτεύς (Prōteús, “Proteus, a sea god who could change his shape at will”)


u-

Typographical substitution for μ, in environments where the correct symbol is not available.

микро- микро-

(informal, proscribed) Alternative form of μ- as an abbreviation of micro-, mikro-, микро- etc.


z-

Coordinate term: Z-

(SI prefix) Abbreviation of zepto- (“10⁻²¹”).


lepido-

Learned borrowing from Ancient Greek λεπίς, λεπίδος (lepís, lepídos, “scale”).

lbor

λεπίς, λεπίδος


myrmeco-

New Latin, from Ancient Greek μύρμηκος (múrmēkos, “ant’s”), genitive of μύρμηξ (múrmēx, “ant”)


oto-

New Latin, from Ancient Greek ὠτ- (ōt-), the stem of οὖς (oûs, “ear”)


leuco-

white, bright, clear, light grey, or pale


actino-

From Ancient Greek, the stem of ἀκτίς (aktís, “ray”).


amphi-

New Latin amphi- (from Ancient Greek ἀμφί (amphí, “on both sides”))


dolicho-

New Latin, from Ancient Greek δολιχός (dolikhós)

Used to form taxonomic names, usually of genera; long-.


dactylo-

New Latin dactylo- (from Ancient Greek δάκτυλος (dáktulos, “finger”))


R-

* (stereochemistry): Abbreviation of Latin rectus (“right”)

(stereochemistry, chemistry) one of two mirror-image forms of a stereocenter, part of a diastereomer

chemical engineering
chemical engineering

(chemical engineering) the prefix indicating a codified refigerant


RS-

(chemistry) both mirror-image forms of a stereocenter, part of a diastereoisomer, when used in a chemical formula or chemical name


(RS)-

(chemistry) both mirror-image forms of a stereocentre, part of a diastereoisomer


DL-

(chemistry) dextrolevo- or race- — both mirror-image forms of an enantiomer; a racemic mix


my-

(pre-SI metric prefix, metrology, obsolete) myria- A factor of a myriad (“10,000”).


tricho-

From Ancient Greek θρίξ (thríx, “hair”).


odonto-

From New Latin, from Ancient Greek ὀδούς (odoús, “tooth”)


acantho-

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


leio-

From Ancient Greek λεῖος (leîos, “smooth”).


anoplo-

New Latin, from Ancient Greek ἄνοπλος (ánoplos, “without shield”)


aphano-

New Latin, from Ancient Greek ἀφανής (aphanḗs, “unseen”)


phaeo-

New Latin, from Ancient Greek φαιός (phaiós, “gray”)


nippono-

From English Nippono-, from Japanese 日本(にっぽん) (Nippon, “Japan”).


eury-

New Latin, from Ancient Greek εὐρύς (eurús, “wide”).


galacto-

New Latin, from Ancient Greek stem γάλακτ- (gálakt-) of γάλα (gála, “milk, milky sap, the Milky Way”)

Used to form medical terms and taxonomic names; milk-related.


papillo-

From Latin papilla (“nipple, breast, pustule, rose bud”).

Used to form medical terms or taxonomic names relating to a papilla in any sense: either a nipple or resembling a nipple


paen-

Used to form taxonomic names or epithets with the meaning of almost or nearly the term to which it is prefixed


chlamydo-

From Ancient Greek χλαμύς (khlamús, “cloak, mantle”).

Used to form taxonomic names and epithets for organisms that have a cloak- or mantle-like structure


d-

(chemistry) deprecated notation for dextrorotatory (versus modern notation, (+)).


thallo-

New Latin, from Ancient Greek θαλλός (thallós, “young shoot, twig”) thallus

Relating to or consisting of undifferentiated plant tissue, as algae.


fimbri-

From Late Latin fimbria (“fringe, tassel”), from Latin fimbriae (“fibers”).

Used to form taxonomic names for taxa of organisms differentiated by having a structure resembling a fringe or a notable edge


cteno-

New Latin, from stem of Ancient Greek κτείς (kteís, “comb”)


monad-

New Latin, from stem of Latin monas (“one”)

Used to form taxonomic names, usually of protozoa (protists)


Lal.

(astronomy) Abbreviation of Lalande. Abbreviated prefix for stars under Lalande designations


sucho-

Of or relating to crocodiles (used in the construction of taxonomic names)


caeno-

From Ancient Greek καινός (kainós, “new”).

Used to form taxonomic names from pre-existing names, indicating more recent discovery or identification or more recent evolutionary descent


notho-

From Ancient Greek νόθος (nóthos, “bastard”).


henico-

New Latin, from Ancient Greek ἑνικός (henikós, “single”)

Used to form taxonomic names, principally of genera; single.


From AISI and SAE standards nomenclature for iron and steel grades for carbon steels with a maximum of 1% carbon content.

(metallurgy) Identifying a steel grade with a maximum of 1% carbon.


From AISI and SAE standards nomenclature for iron and steel grades for chromium steels with roughly 1% chromium.

(metallurgy) Identifying a chromium steel grade with roughly 1% chromium, and a varying amount of carbon.


dk-

Coordinate term: d- (deci-)

(SI prefix, metrology) deka- (“×10¹”); Alternative form of da- (“deca-”)


(linguistic morphology) A representation of the zero prefix.


Z-

Coordinate term: z-

(SI prefix) Abbreviation of zetta- (“10⁺²¹”).


trachy-

Borrowed from Ancient Greek τρᾱχῠ́ς (trākhŭ́s, “spiky, jagged, prickly, bumpy, etc.”).

bor

Bumpy, spiky, rugged, rough, jagged, bumpy, etc.


-dactylus

Borrowed from Ancient Greek δᾰ́κτῠλος (dắktŭlos, “finger”).