/ Dictionary / Index M mescaline: Meaning and Definition of Find definitions for: mes•ca•line Pronunciation: (mes'ku-lēn", -lin), [key] — n. Pharm. a white, water-soluble, crystalline powder, CHNO, obtained from mescal buttons, that produces hallucinations. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mescaline (Thesaurus) Mescalero mesclun Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language