Definition of turquoise

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tur·quoise    (tûrkwoiz, -koiz) KEY 

NOUN:

1. A blue to blue-green mineral of aluminum and copper, mainly CuAl₆(PO₄)₄(OH)₈·4H₂O, prized as a gemstone in its polished blue form.
2. A light to brilliant bluish green.

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ETYMOLOGY:
Middle English turkeis, and French turquoise both from Old French (pierre) turqueise, Turkish (stone), turquoise, feminine of turqueis, Turkish, from Turc, Turk ; see Turk

OTHER FORMS:
turquoise(Adjective)