/ Dictionary / Index M methaqualone: Meaning and Definition of Find definitions for: me•tha•qua•lone Pronunciation: (mu-thak'wu-lōn", meth"u-kwā'lōn, -kwol'ōn), [key] — n. Pharm. a nonbarbiturate sedative-hypnotic substance, CHNO, used to induce sleep: also widely used as an illicit drug. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: methaqualone (Thesaurus) methantheline Methedrine Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language