| Definition of 'HYDROZOA' |
Princeton's WordNet |
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1. (noun) 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
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| Definition of 'HYDROZOA' |
Webster Dictionary |
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1. HYDROZOA
the Acalephae; one of the classes of coelenterates, including the Hydroidea, Discophora, and Siphonophora
2. HYDROZOA
of Hydrozoon
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| Definition of 'HYDROZOA' |
U.S. National Library of Medicine |
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1. 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.
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Definitions of HYDROZOA 
