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From The Collaborative International Dictionary of English v.0.48:
Mysis \My"sis\, prop. n. [NL., fr. Gr. ? a closing of the lips or eyes.] (Zool.) A genus of small schizopod shrimps found both in fresh and salt water; the opossum shrimps. One species inhabits the Great Lakes of North America, and is largely eaten by the whitefish. The marine species form part of the food of right whales. [1913 Webster]