/ Dictionary / Index H hydrogen bromide: Meaning and Definition of Find definitions for: hy'drogen bro'mide Pronunciation: [key] a colorless gas, HBr, having a pungent odor: the anhydride of hydrobromic acid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hydrogen bond hydrogen chloride 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