Eukaryote
Hydrozoa Audio
Hy·dro·zo·a
Subclass of:
Cnidaria
Definitions related to hydrozoa:
  • A class in the phylum CNIDARIA which alternates between polyp and medusa forms during their life cycle. There are over 2700 species in five orders.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • Class in the phylum Cnidaria which alternates between polyp and medusa forms during their life cycle; there are over 2700 species in five orders.
    CRISP Thesaurus
    National Institutes of Health, 2006
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