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also cal·ced·o·ny (kăl-sĕd′n-ē)
n. pl. chal·ced·o·nies also cal·ced·o·nies
A translucent to transparent milky or grayish quartz with distinctive microscopic crystals arranged in slender fibers in parallel bands.

[Late Latin chalcēdonius, from Greek khalkēdōn, a mystical stone (Revelation 21:19), perhaps from Khalkēdōn, Chalcedon.]

chal′ce·don′ic (kăl′sĭ-dŏn′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(kælˈsɛdənɪ) or


n, pl -nies
(Minerals) a microcrystalline often greyish form of quartz with crystals arranged in parallel fibres: a gemstone. Formula: SiO2
[C15: from Late Latin chalcēdōnius, from Greek khalkēdōn a precious stone (Revelation 21:19), perhaps named after Khalkēdōn Chalcedon, town in Asia Minor]
chalcedonic adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(kælˈsɛd n i, ˈkæl sɪˌdoʊ ni)

n., pl. -nies.
a microcrystalline translucent variety of quartz, often milky or grayish.
[1275–1325; Middle English calcedonie < Late Latin chalcēdōnius < Greek chalkēdṓn, identified by St. Jerome with Chalcedon]
chal`ce•don′ic (-sɪˈdɒn ɪk) adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


A type of quartz that has a waxy luster and varies from transparent to translucent. It is used as a gemstone. Agate and onyx are forms of chalcedony.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.chalcedony - a milky or greyish translucent to transparent quartz
quartz - a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities
agate - an impure form of quartz consisting of banded chalcedony; used as a gemstone and for making mortars and pestles
bloodstone, heliotrope - green chalcedony with red spots that resemble blood
carnelian, cornelian - a translucent red or orange variety of chalcedony
chrysoprase - a green variety of chalcedony valued as a gemstone
onyx - a chalcedony with alternating black and white bands; used in making cameos
plasma - a green slightly translucent variety of chalcedony used as a gemstone
sard, sardius, sardine - a deep orange-red variety of chalcedony
transparent gem - a gemstone having the property of transmitting light without serious diffusion
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


[kælˈsɛdənɪ] ncalcedonio
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995
References in periodicals archive ?
Component 1 displays fairly even counts of bifaces and flake tools (Table 5), with a heavy emphasis on cherts and chalcedonies in the debitage and an even greater emphasis on chalcedony used for formal tools (Table 6).
A product of Florence's Grand Ducal Workshops, and probably designed by Bernardino Poccetti, the top incorporates a range of costly and gloriously hued stones, from agates, amethysts, chalcedonies, cornelians and jaspers to lapis lazuli.
These included fossils, metals, stones, coral, shells, alabaster and marble, earths and salts, jaspers, agates, chalcedonies, pyrites, semi-metals, and "stones famous for their pretended [medicinal and miraculous] virtues." According to St.