Kohinoor \Koh`i*noor"\, Kohnur \Koh`*nur\, n. [Per. koh-i-n?r, lit., mountain of light.] A famous diamond, surrendered to the British crown on the annexation of the Punjab. According to Hindoo legends, it was found in a Golconda mine, and has been the property of various Hindoo and Persian rulers.