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[hahy-druh-zoh-uh n] /ˌhaɪ drəˈzoʊ ən/

any freshwater or marine coelenterate of the class Hydrozoa, including free-swimming or attached types, as the hydra, in which one developmental stage, either the polyp or medusa, is absent, and colonial types, as the Portuguese man-of-war, in which both medusa and polyp stages are present in a single colony.
belonging or pertaining to the Hydrozoa.
any colonial or solitary coelenterate of the class Hydrozoa, which includes the hydra, Portuguese man-of-war, and the sertularians
of, relating to, or belonging to the Hydrozoa


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