Meaning & use
Hydrozoa
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A class of small, often colonial aquatic invertebrates, related to jellyfish and corals, that includes hydras and the Portuguese man-of-war.
See it in a sentence
Marine biologists collected samples of hydrozoa from the tide pools.
Hydrozoa display an alternation between polyp and jellyfish-like medusa stages.
A note on using this word
A taxonomic class within the phylum Cnidaria; the freshwater hydra is a familiar example.
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