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From The Collaborative International Dictionary of English v.0.48:
Kohinoor \Koh`i*noor"\, Kohnur \Koh`*nur\ (k[=o]`[i^]*n[=oo]r"), n. [Per. koh-i-n[=u]r, lit., mountain of light.] A famous diamond, surrendered to the British crown on the annexation of the Punjab. According to Hindu legends, it was found in a Golconda mine, and has been the property of various Hindu and Persian rulers. [1913 Webster]