Hydrozoa
Pronunciation : Hy`dro*zo"a
Part of Speech : n.
Etymology : [NL., fr. E. hydra + Gr. (Zo?l.)
Definition : Defn: The Acaleph?; one of the classes of coelenterates, including the Hydroidea, Discophora, and Siphonophora.
pl.
Source : Webster's Unabridged Dictionary, 1913