/ Dictionary / Index M methylphenidate: Meaning and Definition of Find definitions for: meth•yl•phen•i•date Pronunciation: (meth"ul-fen'i-dāt", -fē'ni-), [key] — n. Pharm. a central nervous system stimulant, CHNO, used in the control of hyperkinetic syndromes and narcolepsy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: methylphenidate (Thesaurus) methyl parathion methyl phenol Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language