UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/kælˈsɛdənɪ/US:USA pronunciation: respellingUSA pronunciation: respelling(kal sedn ē, kalsə dō′nē)

Inflections of 'chalcedony' (nnoun: Refers to person, place, thing, quality, etc.): nplplural noun: Noun always used in plural form--for example, "jeans," "scissors.": chalcedonies

WordReference Random House Unabridged Dictionary of American English © 2020
chal•ced•o•ny  (kal sedn ē, kalsə dō′nē),USA pronunciation n., pl.  -nies. 
  1. a microcrystalline, translucent variety of quartz, often milky or grayish.
chal•ce•don•ic  (kal sedn ē, kalsə dō′nē),USA pronunciation  chal•cedo•nous, adj. 
  • Greek chalkēdó̄n chalcedony, identified by Saint Jerome with Chalcedon, the city) + -ius -ious
  • Late Latin chalcēdōnius (Vulgate, Rev. XIX, 19), equivalent. to chalcēdōn- (
  • 1275–1325; Middle English calcedonie

Collins Concise English Dictionary © HarperCollins Publishers::
chalcedony /kælˈsɛdənɪ/ n ( pl -nies)
  1. a microcrystalline often greyish form of quartz with crystals arranged in parallel fibres: a gemstone. Formula: SiO2
Etymology: 15th Century: from Late Latin chalcēdōnius, from Greek khalkēdōn a precious stone (Revelation 21:19), perhaps named after Khalkēdōn Chalcedon, town in Asia Minor

chalcedonic /ˌkælsɪˈdɒnɪk/ adj
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