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topaz

[toh-paz] /ˈtoʊ pæz/
noun
1.
a mineral, a fluosilicate of aluminum, usually occurring in prismatic orthorhombic crystals of various colors, and used as a gem.
2.
citrine (def 2).
3.
either of two South American hummingbirds, Topaza pella or T. pyra, having chiefly red and crimson plumage and a yellowish-green throat with a topaz sheen.
Origin
1225-1275
1225-75; < Latin topazus < Greek tópazos; replacing Middle English topace < Old French < Latin, as above
Related forms
topazine
[toh-puh-zeen, -zin] /ˈtoʊ pəˌzin, -zɪn/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for topaz
  • Regardless of skin color, a surprising number have topaz blue eyes.
  • Visitors can find topaz, rubies and other kinds of gemstones.
British Dictionary definitions for topaz

topaz

/ˈtəʊpæz/
noun
1.
a white or colourless mineral often tinted by impurities, found in cavities in igneous rocks and in quartz veins. It is used as a gemstone. Composition: hydrated aluminium silicate. Formula: Al2SiO4(F,OH)2. Crystal structure: orthorhombic
2.
oriental topaz, a yellowish-brown variety of sapphire
3.
false topaz, another name for citrine
4.
  1. a yellowish-brown colour, as in some varieties of topaz
  2. (as adjective): topaz eyes
5.
either of two South American hummingbirds, Topaza pyra and T. pella
Word Origin
C13: from Old French topaze, from Latin topazus, from Greek topazos
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 topaz
n.

colored crystalline gem, late 13c., from Old French topace (11c.), from Latin topazus, from Greek topazos, topazion, of obscure origin. Pliny says it was named for a remote island in the Red or Arabian Sea, where it was mined, but this might be folk etymology from Greek topazein "to divine, to try to locate;" linguists conjecture a connection with Sanskrit tapas "heat, fire." In the Middle Ages used for almost any yellow stone. To the Greeks and Romans, possibly yellow olivine or yellow sapphire. In modern science, fluo-silicate of aluminum.

Online Etymology Dictionary, © 2010 Douglas Harper
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topaz in Science
topaz
  (tō'pāz')   
  1. A colorless, blue, yellow, brown, or pink orthorhombic mineral valued as a gem. Topaz occurs as transparent or translucent prisms in silica-rich igneous rocks, such as pegmatite, and in tin-bearing rock veins. Chemical formula: Al2SiO4(F,OH)2.

  2. Any of various yellow gemstones, especially a yellow variety of sapphire or corundum.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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topaz in the Bible

Heb. pitdah (Ezek. 28:13; Rev. 21:20), a golden yellow or "green" stone brought from Cush or Ethiopia (Job 28:19). It was the second stone in the first row in the breastplate of the high priest, and had the name of Simeon inscribed on it (Ex. 28:17). It is probably the chrysolite of the moderns.

Easton's 1897 Bible Dictionary
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