HYDROZOA

Hydrozoa, class Hydrozoa

(noun) coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes

HYDROZOAN

hydrozoan, hydroid

(noun) colonial coelenterates having the polyp phase dominant

Source: WordNet® 3.1

Etymology

Noun

hydrozoa pl (plural only)

A large group of marine animals, of the class Hydrozoa, whose life cycles contain a sexual and asexual stage

Source: Wiktionary

Hy`dro*zo"a, n. pl. Etym: [NL., fr. E. hydra + Gr. (Zoöl.)

Definition: The Acalephæ; one of the classes of coelenterates, including the Hydroidea, Discophora, and Siphonophora.

HYDROZOON

Hy`dro*zo"ön, n.; pl. L. Hydrozoa, E. Hydrozoöns. Etym: [NL.] (Zoöl.)

Definition: One of the Hydrozoa.

Source: Webster’s Unabridged Dictionary 1913 Edition

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