[ tur-koiz, -kwoiz ]
See synonyms for turquoise on Thesaurus.com
  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.

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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

Words Nearby turquoise

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use turquoise in a sentence

British Dictionary definitions for turquoise


/ (ˈtɜːkwɔɪz, -kwɑːz) /

  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: CuAl 6 (PO 4) 4 (OH) 8 .4H 2 O

    • the colour of turquoise

    • (as adjective): a turquoise dress

Origin of turquoise

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


[ tûrkwoiz′, -koiz′ ]

  1. 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.