/ Dictionary / Index M Marcellus II: Meaning and Definition of Find definitions for: Marcellus II Pronunciation: [key] (Marcello Cervini) 1501–55, Italian ecclesiastic: pope 1555. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Marcellus I marcescent Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language