/ Dictionary / Index O opossum: Meaning and Definition of Find definitions for: o•pos•sum Pronunciation: (u-pos'um, pos'um), [key] — pl. -sums, -sum. a prehensile-tailed marsupial, Didelphis virginiana, of the eastern U.S., the female having an abdominal pouch in which its young are carried: noted for the habit of feigning death when in danger. any of various animals of related genera. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: opossum (Thesaurus) Oporto opossum shrimp Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language