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turquoise

[tur-koiz, -kwoiz] /ˈtɜr kɔɪz, -kwɔɪz/
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
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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British Dictionary definitions for turquois

turquoise

/ˈtɜːkwɔɪz; -kwɑːz/
noun
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.
  1. the colour of turquoise
  2. (as adjective): a turquoise dress
Word Origin
C14: from Old French turqueise Turkish (stone)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for turquois

turquoise

n.

precious stone, 1560s, replacement from Middle French of Middle English turkeis, turtogis (late 14c.), from Old French fem. adjective turqueise "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 Spanish turquesa, Medieval Latin (lapis) turchesius, Middle Dutch turcoys, German türkis, Swedish turkos. As a color name, attested from 1853.

Online Etymology Dictionary, © 2010 Douglas Harper
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turquois in Science
turquoise
  (tûr'kwoiz', -koiz')   
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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