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mysis

noun my·sis \ ˈmīsə̇s \
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Definition of mysis

1 capitalized : the type genus of the family Mysidae
2 plural -es or mysis stage : a larva of higher crustaceans (as macrurans and peneids) having all the thoracic appendages biramous

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Origin and Etymology of mysis

New Latin, from Greek mysis action of closing (used of the lips or eyes), from myein to close (used of the lips or eyes), close the eyes + -sis

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