Definition of koh–i–noor
: something that is or is felt to be the best of its kind; especially : a usually large and valuable diamond a young Spaniard with a Koh-i-noor of a diamond on his finger and pearls the size of camphor balls in his shirt front — W. J. Locke
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Origin and Etymology of koh–i–noor
from Koh-i-noor, famous diamond that became part of the British crown jewels after the annexation of Punjab by Great Britain in 1849, from Persian Kōh-i-nūr, literally, mountain of light
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