a mineral, a fluosilicate of aluminum, usually occurring in prismatic orthorhombic crystals of various colors, and used as a gem.
citrine ( def 2 ).
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.

1225–75; < Latin topazus < Greek tópazos; replacing Middle English topace < Old French < Latin, as above

topazine [toh-puh-zeen, -zin] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
topaz (ˈtəʊpæz)
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.  a.  a yellowish-brown colour, as in some varieties of topaz
 b.  (as adjective): topaz eyes
5.  either of two South American hummingbirds, Topaza pyra and T. pella
[C13: from Old French topaze, from Latin topazus, from Greek topazos]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

colored crystalline gem, c.1272, from O.Fr. topace (11c.), from L. topazus, from Gk. topazos, topazion, of obscure origin. Pliny says it was named for an island in the Red or Arabian Sea, where it was mined; linguists conjecture a connection with Skt. tapas "heat, fire."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
topaz   (tō'pāz')  Pronunciation Key 
  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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Bible Dictionary

Topaz definition

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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