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[kal-sed-n-ee, kal-suh-doh-nee] /kælˈsɛd n i, ˈkæl səˌdoʊ ni/
noun, plural chalcedonies.
a microcrystalline, translucent variety of quartz, often milky or grayish.
Origin of chalcedony
1275-1325; Middle English calcedonie < Late Latin chalcēdōnius (Vulgate, Rev. XIX, 19), equivalent to chalcēdōn- (< Greek chalkēdṓn chalcedony, identified by Saint Jerome with Chalcedon, the city) + -ius -ious
Related forms
[kal-si-don-ik] /ˌkæl sɪˈdɒn ɪk/ (Show IPA),
chalcedonous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for chalcedony


noun (pl) -nies
a microcrystalline often greyish form of quartz with crystals arranged in parallel fibres: a gemstone. Formula: SiO2
Derived Forms
chalcedonic (ˌkælsɪˈdɒnɪk) adjective
Word Origin
C15: from Late Latin chalcēdōnius, from Greek khalkēdōn a precious stone (Revelation 21:19), perhaps named after Khalkēdōn Chalcedon, town in Asia Minor
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 chalcedony

c.1300, from Latin calcedonius, in Vulgate translating Greek khalkedon in Rev. xxi:19, found nowhere else. Connection with Chalcedon in Asia Minor "is very doubtful" [OED]. The city name is from Phoenician and means "new town."

Online Etymology Dictionary, © 2010 Douglas Harper
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chalcedony in Science
A type of quartz that has a waxy luster and varies from transparent to translucent. It is usually white, pale-blue, gray, brown, or black and is often found as a lining in cavities. Agate, flint, and onyx are forms of chalcedony. Chemical formula: SiO2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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