Ab‐ac″ti‐nal (ăb‐ăk″tĭ‐nal), a. [L. ab + E. actinal.] (Zoöl.) Pertaining to the surface or end opposite to the mouth in a radiate animal; — opposed to actinal. “The aboral or abactinal area.” L. Agassiz.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.