/ Dictionary / Index M metathesize: Meaning and Definition of Find definitions for: me•tath•e•size Pronunciation: (mu-tath'u-sīz"), [key] — -sized, -siz•ing. to cause to undergo or undergo metathesis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. metathesis metathorax Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language