carbuncleyoudaoicibaDictYouDict[carbuncle 词源字典]
carbuncle: [13] Etymologically, a carbuncle is a ‘small piece of coal’. It comes ultimately from Latin carbunculus, a diminutive form of carbō ‘coal’ (source of English carbon). This reached English via Old French carbuncle. The Latin word had two main metaphorical meanings, based on the idea of a glowing coal: ‘red gem’ and ‘red inflamed spot’, both of which passed into English.

The latter achieved some notoriety in British English in the 1980s following a remark by the Prince of Wales in 1984 comparing a piece of modern architecture unfavourably to a ‘carbuncle’, although ironically from the 15th to the 17th centuries the word was used for ‘something of great splendour’.
=> carbon[carbuncle etymology, carbuncle origin, 英语词源]
carbuncle (n.)youdaoicibaDictYouDict
early 13c., "fiery jewel," from Old North French carbuncle (Old French charbocle, charboncle) "carbuncle-stone," also "carbuncle, boil," from Latin carbunculus "red gem," also "red, inflamed spot," literally "a little coal," from carbo (genitive carbonis) "coal" (see carbon). Originally of rubies, garnets, and other red jewels; in English the word was applied to tumors from late 14c.