/ Dictionary / Index M monticellite: Meaning and Definition of Find definitions for: mon•ti•cel•lite Pronunciation: (mon"tu-sel'īt, -chel'-), [key] — n. a mineral, silicate of magnesium and calcium, CaMgSiO, belonging to the olivine group and often occurring in contact metamorphosed limestones. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. month's mind Monticello Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language