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- (zoology) Pertaining to the surface or end opposite to the mouth in a radiate animal.
- 1857, Louis Agassiz, Contributions to Natural History, volume 4, page 376:
- The so-called mouth is always placed at one end of these poles, and from it radiate the most prominent organs, in consequence of which I have called this side of the body the oral or actinal area, and the opposite side the aboral or abactinal area.
pertaining to the surface or end opposite to the mouth in a radiate animal