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turquoise

[ tur-koiz, -kwoiz ]
/ ˈtɜr kɔɪz, -kwɔɪz /
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noun

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.
Also called turquoise blue . a greenish blue or bluish green.

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Origin of turquoise

1350–1400; <French: Turkish (stone), equivalent to TurcTurk + -oise, feminine of -ois-ese; replacing Middle English turkeis<Middle French
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for turquoise

turquoise
/ (ˈtɜːkwɔɪz, -kwɑːz) /

noun

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: CuAl 6 (PO 4) 4 (OH) 8 .4H 2 O
  1. the colour of turquoise
  2. (as adjective)a turquoise dress
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

Scientific definitions for turquoise

turquoise
[ tûrkwoiz′, -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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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