mysis

noun my·sis \ˈmīsə̇s\

Definition of mysis

  1. 1 capitalized :  the type genus of the family Mysidae

  2. 2 or mysis stage plural -es :  a larva of higher crustaceans (as macrurans and peneids) having all the thoracic appendages biramous

Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Join MWU now and get access to America’s largest dictionary, with:

  • 300,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

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 — more at mystery


Seen and Heard

What made you want to look up mysis? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

feeling or affected by lethargy

Get Word of the Day daily email!