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Meaning of hydrozoan

hy•dro•zo•an

Pronunciation: (hī"dru-zō'un), [key]
— n.
  1. 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.
—adj.
  1. belonging or pertaining to the Hydrozoa.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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