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.

1875–80; < Neo-Latin Hydrozo(a) (see hydro-1, -zoa) + -an

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World English Dictionary
hydrozoan (ˌhaɪdrəʊˈzəʊən)
1.  any colonial or solitary coelenterate of the class Hydrozoa, which includes the hydra, Portuguese man-of-war, and the sertularians
2.  of, relating to, or belonging to the Hydrozoa

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Example sentences
Calling this hydrozoan a coral, however, is a bit misleading-it's more closely related to sea jellies.
Procedures for eradication of hydrozoan pests in closed-system mysid culture.
Some hydrozoan jellyfish, or hydromedusae, are also found in fresh water.
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