Dictionary
hy•dro•rhi•za
Pronunciation: (hī"dru-rī'zu), [key]—
n.,
—pl. -zaePronunciation: (-zē). [key]
the rootlike base of a hydroid colony, by which it is attached to the substratum.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.