turquoise

[tur-koiz, -kwoiz]
noun
1.
Also, turquois. an opaque mineral, a basic hydrous copper aluminum phosphate often containing a small amount of iron, sky-blue or greenish-blue in color, cut cabochon as a gem. Compare bone turquoise.
2.
Also called turquoise blue. a greenish blue or bluish green.

Origin:
1350–1400; < French: Turkish (stone), equivalent to Turc Turk + -oise, feminine of -ois -ese; replacing Middle English turkeis < Middle French

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
turquoise (ˈtɜːkwɔɪz, -kwɑːz)
 
n
1.  a greenish-blue fine-grained secondary mineral consisting of hydrated copper aluminium phosphate. It occurs in igneous rocks rich in aluminium and is used as a gemstone. Formula: CuAl6(PO4)4(OH)8.4H2O
2.  a.  the colour of turquoise
 b.  (as adjective): a turquoise dress
 
[C14: from Old French turqueise Turkish (stone)]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

turquoise
precious stone, 1560s, replacement from M.Fr. of M.E. turkeis, turtogis (late 14c.), from O.Fr. turqueise, fem. adj. "Turkish," in pierre turqueise "Turkish stone," so called because it was first brought to Europe from Turkestan or some other Turkish dominion (Sinai peninsula, according to one theory).
Cognate with Sp. turquesa, M.L. (lapis) turchesius, M.Du. turcoys, Ger. türkis, Swed. turkos. As a color name, attested from 1853.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
turquoise   (tûr'kwoiz', -koiz')  Pronunciation Key 
A blue to bluish-green or yellowish-green triclinic mineral that occurs in reniform (kidney-shaped) masses with surfaces shaped like a bunch of grapes, especially in aluminum-rich igneous rocks such as trachyte. In its polished blue form it is prized as a gem. Chemical formula: CuAl6(PO4)4(OH)8·5H2O
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Turquoise ranges in color from sky-blue to greenish-blue.
There is a turquoise car in the driveway right now, in fact.
He showed up for the interview wearing khaki green corduroy pants with a
  hand-knit turquoise sweater.
Turquoise beads alternate with gold-finished pewter.
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