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chalcedony

Pronunciation: /kalˈsɛdəni/

Definition of chalcedony

noun (plural chalcedonies)

[mass noun]
  • a microcrystalline type of quartz occurring in several different forms including onyx and agate.

Derivatives

chalcedonic

Pronunciation: /ˌkalsɪˈdɒnɪk/

adjective

Origin:

late Middle English: from Latin calcedonius, chalcedonius (often believed to mean 'stone of Chalcedon', but this is doubtful), from Greek khalkēdōn

chalcedony in other Oxford dictionaries

Definition of chalcedony in the US English dictionary