/ Dictionary / Index C chalcedony: Meaning and Definition of Find definitions for: chal•ced•o•ny Pronunciation: (kal-sed'n-ē, kal'su-dō"nē), [key] — pl. -nies. a microcrystalline, translucent variety of quartz, often milky or grayish. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: chalcedony (Thesaurus) Chalcedon chalcidfly Related Content Daily Word Quiz: eccentric Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language