Source : Webster's Revised Unabridged Dictionary (1913)

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.