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acoel (plural acoels)
- (zoology) A member of the Acoela group of marine flatworms, which lack a digestive cavity with definite walls. [from 20th c.]
- 2012, Caspar Henderson, The Book of Barely Imagined Beings, 2013 edition, Granta Books, page 89:
- Acoels have no brain or ganglia but a network of nerves beneath the skin that is slightly more concentrated towards the front end.