class hydrozoa

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	Definition:		[n]  coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes
	Synonyms:		Hydrozoa
	See Also:		class, Cnidaria, Coelenterata, genus Hydra, genus Sertularia, hydroid, hydrozoan, order Siphonophora, phylum Cnidaria, phylum Coelenterata, Sertularia, Siphonophora