/ Dictionary / Index H hydroa: Meaning and Definition of Find definitions for: hy•dro•a Pronunciation: (hī-drō'u), [key] — n. Pathol. any skin condition characterized by red vesicular areas. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hydro hydroaerobics Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language