/ Dictionary / Index R realgar: Meaning and Definition of Find definitions for: re•al•gar Pronunciation: (rē-al'gur, -gär), [key] — n. arsenic disulfide, AsS, found in nature as an orange-red mineral and also produced artificially: used in pyrotechnics. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: realgar (Thesaurus) real-estate investment trust realia 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