/ Dictionary / Index M Massys: Meaning and Definition of Find definitions for: Mas•sys Pronunciation: (mä'sīs), [key] 1466?–1530, Flemish painter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. massy mast Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language