Cornish

[kawr-nish] /ˈkɔr nɪʃ/
adjective
1.
of, pertaining to, or characteristic of Cornwall, England, its inhabitants, or the Cornish language.
noun
2.
the Celtic language of Cornwall, extinct since c1800.
3.
one of an English breed of chickens raised chiefly for crossing with other breeds to produce roasters.
Origin
1350-1400; late Middle English, apparently syncopated variant of Middle English Cornwelisse. See Cornwall, -ish1
British Dictionary definitions for Cornish

Cornish

/ˈkɔːnɪʃ/
adjective
1.
of, relating to, or characteristic of Cornwall, its inhabitants, their former language, or their present-day dialect of English
noun
2.
a former language of Cornwall, belonging to the S Celtic branch of the Indo-European family and closely related to Breton: extinct by 1800
3.
(functioning as pl) the Cornish, the natives or inhabitants of Cornwall
Word Origin and History for Cornish
adj.

from first element of Cornwall + -ish.