Definition of Cornish noun from the Oxford Advanced Learner's Dictionary

 

Cornish

 noun
noun
BrE BrE//ˈkɔːnɪʃ//
 
; NAmE NAmE//ˈkɔːrnɪʃ//
 
Languages
 
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[uncountable] the Celtic language that was spoken in Cornwall in England. Nobody now uses Cornish as a first language. See related entries: Languages Word Origin late Middle English: from the first element of Cornwall (the county occupying the extreme south western peninsula of England) + -ish.