'Hydrozoa' definitions:
Definition of 'Hydrozoa'
From: WordNet
noun
Coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes [syn: Hydrozoa, class Hydrozoa]
Definition of 'Hydrozoa'
From: GCIDE
- Hydrozoa \Hy`dro*zo"a\, n. pl. [NL., fr. E. hydra + Gr. zo^,on an animal.] (Zool.) The Acaleph[ae]; one of the classes of c[oe]lenterates, including the Hydroidea, Discophora, and Siphonophora. [1913 Webster]
Definition of 'Hydrozoa'
From: GCIDE
- Hydrozoon \Hy`dro*zo"["o]n\, n.; pl. L. Hydrozoa, E. {Hydrozo["o]ns}. [NL.] (Zool.) One of the Hydrozoa. [1913 Webster]