Hydrozoa

n. pl.

1.

(Zool.) The Acalephæ; one of the classes of cœlenterates, including the Hydroidea, Discophora, and Siphonophora.

Noun

1.

Hydrozoa - coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes Synonyms: class Hydrozoa

class, class Hydrozoa, Cnidaria, Coelenterata, genus Hydra, genus Sertularia, hydroid, hydrozoan, order Siphonophora, phylum Cnidaria, phylum Coelenterata, Sertularia, Siphonophora