/ Dictionary / Index M methacetin: Meaning and Definition of Find definitions for: meth•a•ce•tin Pronunciation: (meth"u-sēt'n), [key] — n. Pharm. a white, crystalline, water-insoluble powder, CHNO, used for relieving pain and reducing or preventing fever. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. meth methacrylate 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