Hydrozoa :: Hydrozoa (n. pl.) The Acalephae; one of the classes of coelenterates, including the Hydroidea, Discophora, and Siphonophora..

Hydrozoa :: Hydrozoa (pl. ) of Hydrozoo.

Hydrozoal :: Hydrozoal (a.) Of or pertaining to the Hydrozoa.

Hydrozoon :: Hydrozoon (n.) One of the Hydrozoa.

Hydrozoons :: Hydrozoons (pl. ) of Hydrozoo.

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