/ ˈkɑːbʌŋkl; NAmE ˈkɑːrb-/ noun
1.
a large painful swelling under the skin
2.
a bright red jewel , usually cut into a round shape
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WORD ORIGIN
Middle English (in sense 2): from Old French charbuncle , from Latin carbunculus small coal, from carbo coal, charcoal.