/ Dictionary / Index M marsupium: Meaning and Definition of Find definitions for: mar•su•pi•um Pronunciation: (mär-s'pē-um), [key] — pl. -pi•a the pouch or fold of skin on the abdomen of a female marsupial. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: marsupium (Thesaurus) marsupial mouse Mars violet Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language