turquoise

Etymology

From Middle French turquoise, from Old French (pierre) turquoise (“Turkish (stone)”), from turc + -ois. The stone, mined near Nishapur in the Khorasan region of Persia, was originally brought to Europe through Turkey. Doublet of Turkish.

noun

1. (countable) A sky-blue, greenish-blue, or greenish-gray semi-precious gemstone.
   Although there are dozens of different types of gems, among the best known and most important are […] . (Common gem materials not addressed in this article include amber, amethyst, chalcedony, garnet, lazurite, malachite, opals, peridot, rhodonite, spinel, tourmaline, turquoise and zircon.) 2012-03, Lee A. Groat, “Gemstones”, in American Scientist, volume 100, number 2, archived from the original on 2012-06-14, page 128
2. (countable and uncountable) A pale greenish-blue colour, like that of the gemstone.
   The half-dozen pieces […] were painted white and carved with festoons of flowers, birds and cupids. To display them the walls had been tinted a vivid blue which had now faded, but the carpet, which had evidently been stored and recently relaid, retained its original turquoise. 1963, Margery Allingham, chapter 1, in The China Governess
   turquoise:

adj

1. Made of turquoise (the gemstone).
2. Having a pale greenish-blue colour.