any small, shrimplike crustacean of the order Mysidacea, the females of which carry their eggs in a pouch between the legs.
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British Dictionary definitions for opossum shrimp
any of various shrimplike crustaceans of the genera Mysis, Praunus, etc, of the order Mysidacea, in which the females carry the eggs and young around in a ventral brood pouch
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012