hydrozoa

Hydrozoa

Hy`dro*zo"a\, n. pl. [NL., fr. E. hydra + Gr. ? an animal.] (Zo["o]l.) The Acaleph[ae]; one of the classes of c[oe]lenterates, including the Hydroidea, Discophora, and Siphonophora.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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WordNet
hydrozoa

noun
coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes 
WordNet® 3.0, © 2006 by Princeton University.
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