/ Dictionary / Index M mesoappendix: Meaning and Definition of Find definitions for: mes•o•ap•pen•dix Pronunciation: (mez"ō-u-pen'diks, mes"-, mē"zō-, -sō-), [key] — pl. -dix•es, -di•ces the mesentery of the vermiform appendix. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Mesoamerica mesoblast Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language