/ Dictionary / Index H hydroxide: Meaning and Definition of Find definitions for: hy•drox•ide Pronunciation: (hī-drok'sīd, -sid), [key] — n. a chemical compound containing the hydroxyl group. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hydroxide (Thesaurus) hydrous hydroxide ion Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language