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Dictionary

hy•dro•zo•an

Pronunciation: (hī"dru-zō'un), [key]
—n.
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.
belonging or pertaining to the Hydrozoa.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

hydrozincite

Hydrus

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