Hydrozoan definition
Any of various cnidarians of the class Hydrozoa, including the hydras, hydroids, and siphonophores, which exhibit alternation of generations between the polyp and medusa stage or exist in only one or the other stage.
noun
Of a class (Hydrozoa) of cnidarians having a saclike body consisting of two layers of cells, and a mouth that opens directly into the body cavity.
adjective
Any animal of this class, as a hydroid or Portuguese man-of-war.
noun
(biology) Any of many colonial coelenterates, of the class Hydrozoa, including the hydras, hydroids, hydrocorals, and siphonophores.
noun
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Other Word Forms
Noun
Singular:
hydrozoan
Plural:
hydrozoansOrigin of hydrozoan
- From New Latin Hydrozōa class name Hydra type genus hydra -zōa pl. of -zōon -zoon
From American Heritage Dictionary of the English Language, 5th Edition