| Word | Definitions | Synonyms |
|---|---|---|
| aorist | (noun) a verb tense in some languages (classical Greek and Sanskrit) expressing action (especially past action) without indicating its completion or continuation | - |
| aorta | (noun) the large trunk artery that carries blood from the left ventricle of the heart to branch arteries | - |
| aortitis | (noun) inflammation of the aorta | - |
| aoudad | (noun) wild sheep of northern Africa | Synonyms: Ammotragus lervia, arui, audad, Barbary sheep, maned sheep |