cornish
US /ˈkɔːr.nɪʃ/
UK /ˈkɔːr.nɪʃ/

1.
relating to Cornwall or its people or language
:
•
She is proud of her Cornish heritage.
•
The Cornish language is a Celtic language.
1.
the Celtic language of Cornwall
:
•
He is studying Cornish at university.
•
Efforts are being made to revive Cornish.