AO -abbr
- account of
- and others
AOK [,ā-(,)ō-'kā] -adv or adj
- very definitely OK
aor -abbr
- aorist
ao·rist ['ā-ə-rəst] -n, adj, adv
- an inflectional form of a verb typically denoting simple occurrence of an action without reference to its completeness, duration, or repetition
aor·ta [ā-'ȯr-tə] -n, adj
- the great arterial trunk that carries blood from the heart to be distributed by branch arteries through the body
aortic arch -n
- one of the arterial branches in vertebrate embryos that exist in a series of pairs with one on each side of the embryo, connect the ventral arterial system lying anterior to the heart to the dorsal arterial system above the alimentary tract, and persist in adult fishes but are reduced or much modified in the adult of higher forms
aor·tog·ra·phy [,ā-,ȯr-'tä-grə-fē] -n, adj
- arteriography of the aorta
aou·dad ['au̇-,dad, 'ä-u̇-] -n
- a wild bovine ( Ammotragus lervia) of No. Africa that is closely related to goats and sheep and has been introduced into the southwestern U.S. called also aoudad sheep, Barbary sheep