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Noun class hydrozoa has 1 sense
- 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:
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