/ Dictionary / Index H halazone: Meaning and Definition of Find definitions for: hal•a•zone Pronunciation: (hal'u-zōn"), [key] — n. a white crystalline powder, CHClNOS, having a strong chlorinelike odor, used to disinfect water. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. halazepam halberd Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language