/ Dictionary / Index H hydr-: Meaning and Definition of Find definitions for: hydr- Pronunciation: [key] var. of before a vowel: hydrant. hydr- Pronunciation: [key] var. of before a vowel: hydride. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hydnocarpic acid hydra Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language