acoel
nounUK /ˈeɪsiːl/
Etymology From group name Acoela, from Ancient Greek ἄκοιλος (ákoilos, “not hollow”).
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Biology, Natural sciences, Zoology Obsolete A member of the order Acoela of marine flatworms, which lack a digestive cavity with definite walls.
- Acoels have no brain or ganglia but a network of nerves beneath the skin that is slightly more concentrated towards the front end.2012, Caspar Henderson, The Book of Barely Imagined Beings, Granta Books, published 2013, page 89: