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Bryozoa (n.)

lowest class of mollusks, 1837, from bryo- "moss" + -zoa "animal," from Greek zoia, plural of zoion "animal" (from PIE root *gwei- "to live"). So called from the appearance of some species.

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Definitions of Bryozoa from WordNet

Bryozoa (n.)
marine or freshwater animals that form colonies of zooids;
Synonyms: phylum Bryozoa / polyzoa
From wordnet.princeton.edu