/ Dictionary / Index M metatherian: Meaning and Definition of Find definitions for: met•a•the•ri•an Pronunciation: (met"u-thēr'ē-un), [key] — adj. belonging or pertaining to the group Metatheria, comprising the marsupial mammals. —n. a metatherian animal. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: metatherian (Thesaurus) metate metathesis Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language