/ Dictionary / Index M Metastasio: Meaning and Definition of Find definitions for: Me•ta•sta•sio Pronunciation: (me"tä-stä'zyô), [key] — n. 1698–1782, Italian poet and dramatist. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. metastable metastasis 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