Learn how to say Carbuncular correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word carbuncle:
1a severe abscess or multiple boil in the skin, typically infected with staphylococcus bacteria.
2a bright red gem, in particular a garnet cut en cabochon.
Middle English (in sense 2): from Old French charbuncle, from Latin carbunculus ‘small coal’, from carbo ‘coal, charcoal’