my·sid (m  s d)n. Any of various small, shrimplike, chiefly marine crustaceans of the order Mysidacea, the females of which carry their eggs in a pouch beneath the thorax. Also called opossum shrimp. [From New Latin Mysis, Mysid-, type genus, from Greek musis, a closing, from m  ein, to close the lips or eyes.] |
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