Dictionary entry

Abactinal

Webster's Dictionary 1913

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.