(definition) by Webster 1913 Wed Dec 22 1999 at 0:15:09

Hy`dro*zo"a (?), n. pl. [NL., fr. E. hydra + Gr. an animal.] Zool.

The Acalephae; one of the classes of celenterates, including the Hydroidea, Discophora, and Siphonophora.

 

© Webster 1913.

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