[ kal-sed-n-ee, kal-suh-doh-nee ]
/ kælˈsɛd n i, ˈkæl səˌdoʊ ni /
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noun, plural chal·ced·o·nies.

a microcrystalline, translucent variety of quartz, often milky or grayish.



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Origin of chalcedony

First recorded in 1275–1325; Middle English calcedonie, from Late Latin chalcēdōnius (Vulgate, Revelation 21:19), equivalent to chalcēdōn- (from Greek chalkēdṓn “chalcedony,” identified by Saint Jerome with Chalcedon, the city) + -ius adjective suffix; see -ious


chal·ce·don·ic [kal-si-don-ik], /ˌkæl sɪˈdɒn ɪk/, chal·ced·o·nous, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for chalcedony

British Dictionary definitions for chalcedony

/ (kælˈsɛdənɪ) /

noun plural -nies

a microcrystalline often greyish form of quartz with crystals arranged in parallel fibres: a gemstone. Formula: SiO 2

Derived forms of chalcedony

chalcedonic (ˌkælsɪˈdɒnɪk), adjective

Word Origin for chalcedony

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

Scientific definitions for chalcedony

[ kăl-sĕdn-ē ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.