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