/ Dictionary / Index M monophthongize: Meaning and Definition of Find definitions for: mon•oph•thong•ize Pronunciation: (mon'uf-thông-īz", -gīz", -thong-), [key] — v., -ized, -iz•ing. —v.t. to change into or pronounce as a monophthong. —v.i. to become a monophthong. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. monophthong monophyletic Related Content Daily Word Quiz: winsome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language