Any of various mosslike aquatic animals usually forming branching colonies

• Each polyp having a both mouth and anus within a closed ring of tentacles

Wiktionary Word definitions in Wiktionary
n. (context zoology English) Any member of the Entoprocta, a phylum of mostly sessile aquatic animals.

WordNet Word definitions in WordNet
n. any of various mosslike aquatic animals usually forming branching colonies; each polyp having a both mouth and anus within a closed ring of tentacles