/ Dictionary / Index H hydrogel: Meaning and Definition of Find definitions for: hy•dro•gel Pronunciation: (hī'dru-jel"), [key] — n. a gel whose liquid constituent is water. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hydrogel (Thesaurus) hydrofracturing hydrogen Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language