ˈkōəˌnu̇(ə)r noun
( plural koh-i-noors )
Usage: often capitalized
Etymology: 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
: 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