/ Dictionary / Index M Marcello: Meaning and Definition of Find definitions for: Mar•cel•lo Pronunciation: (mär-chel'lô), [key] 1686–1739, Italian composer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Marcellinus Marcellus 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