CHALCEDONY Meaning of CHALCEDONY in English n. a type of quartz occurring in several different forms, e.g. onyx, agate, tiger's eye, etc. chalcedonic adj.[ ME f. L c(h)alcedonius f. Gk khalkedon ] Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012