| hydrozoa | <zoology> The Acalephae; one of the classes of coelenterates, including the Hydroidea, Discophora, and Siphonophora. Origin: NL, fr. E. Hydra + Gr. An animal. Source: Websters Dictionary (01 Mar 1998) |
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| hydrozoal | <zoology> Of or pertaining to the Hydrozoa. Source: Websters Dictionary (01 Mar 1998) |