/ Dictionary / Index M methamphetamine: Meaning and Definition of Find definitions for: meth•am•phet•a•mine Pronunciation: (meth"am-fet'u-mēn", -min), [key] — n. Pharm. a central nervous system stimulant, CHN, used clinically in the treatment of narcolepsy, hyperkinesia, and for blood pressure maintenance in hypotensive states: also widely used as an illicit drug. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: methamphetamine (Thesaurus) methaemoglobin methanal 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