/ Dictionary / Index M metamorphic facies: Meaning and Definition of Find definitions for: met'amor'phic fa'cies Pronunciation: [key] a group of metamorphic rock units characterized by particular mineralogic associations. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. metamorphic metamorphism Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language