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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Ab·ac·ti·nal a.  Zool. Pertaining to the surface or end opposite to the mouth in a radiate animal; -- opposed to actinal. “The aboral or abactinal area.”
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From: WordNet (r) 2.0

 abactinal
      adj : (of radiate animals) located on the surface or end opposite
            to that on which the mouth is situated [ant: actinal]