/ Dictionary / Index H Halcion: Meaning and Definition of Find definitions for: Hal•ci•on Pronunciation: (hal'sē-on"), [key] a benzodiazepine, used as a sleeping drug and as an anxiolytic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: halcion (Thesaurus) Halberstam halcyon Related Content Daily Word Quiz: ounterfeit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language