Noun class hydrozoa has 1 sense
  1. Hydrozoa, class Hydrozoa - coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes
    --1 is a kind of class
    --1 is a member of Cnidaria, phylum Cnidaria, Coelenterata, phylum Coelenterata
    --1 has members:
     hydrozoan, hydroid; genus Hydra; Siphonophora, order Siphonophora; Sertularia, genus Sertularia
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