Definition of a- in English:

a-

Pronunciation: /ə, eɪ, a/
(often an- before a vowel)

prefix

Not; without: atheistic acephalous

Origin

from Greek.

Definition of a- in:

Get more from Oxford Dictionaries

Subscribe to remove ads and access premium resources

Word of the day neoteny
Pronunciation: nēˈätn-ē
noun
retention of juvenile features in the adult animal