OPOS'SUM, noun A quadruped of the genus Didelphis. It has a prehensile tail, like some of the monkeys, and is distinguished by a pouch or false belly, in which it protects and carries its young. The name is also given to other species of the genus, some of which want the pouch.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.