/ ˈkɔːnɪʃ; NAmE ˈkɔːrnɪʃ/ noun , adjective
■ noun
[ U ] the Celtic language that was spoken in Cornwall in England. Nobody now uses Cornish as a first language.
■ adjective
connected with Cornwall, or its people, language or culture
For more information see the Cultural Guide
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WORD ORIGIN
late Middle English : from the first element of Cornwall (the county occupying the extreme south western peninsula of England) + -ish .