KarachaiPronunciation: /ˌkarəˈtʃʌɪ/ (also Karachay)Definition of Karachai noun 1a member of an indigenous people living in Karachai-Cherkessia. 2 (also Karachay-Balkar) [mass noun] the Turkic language of the Karachai, with under 200,000 speakers. adjective relating to the Karachai or their language. Origin:from Turkic, from kara, qara 'back' and chai 'brook'Karachai in other Oxford dictionaries Definition of Karachai in the US English dictionary