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- (General American) IPA(key): /æˈbæk.tə.nl̩/, /ˈæˌbæk.tə.nl̩/, /ˌæˌbækˈtaɪ.nl̩/, /ˈæˌbækˌtaɪ.nl̩/
- (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.
- Antonym: actinal
pertaining to the surface or end opposite to the mouth in a radiate animal