variant of hydro-1 before a vowel: hydrant.
Definition for hydr- (2 of 2)
variant of hydro-2 before a vowel: hydride.
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British Dictionary definitions for hydr-
a variant of hydro-
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Medicine definitions for hydr-
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.