Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. A translucent to transparent milky or grayish quartz with distinctive microscopic crystals arranged in slender fibers in parallel bands.

Century Dictionary and Cyclopedia

  1. n. A cryptocrystalline variety of quartz, resembling in color milk diluted with water, and more or less clouded or opaque with veins, circles, or spots. It is used in jewelry. There are several varieties, as common chalcedony, chrysoprase, sard, and sardonyx. Also called white agate. Also spelled calcedony. See cut under botryoid.

Wiktionary

  1. n. A form of fine-grained quartz that is nearly transparent or has a milky translucence; it fractures conchoidally.

GNU Webster's 1913

  1. n. A cryptocrystalline, translucent variety of quartz, having usually a whitish color, and a luster nearly like wax.

WordNet 3.0

  1. n. a milky or greyish translucent to transparent quartz

Etymologies

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

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‘chalcedony’ has been looked up 1283 times, loved by 4 people, added to 31 lists, and has a Scrabble score of 21.