carbuncle

/ˌkɑrˈbʌŋkəl/

Other forms: carbuncles

Definitions of carbuncle

1. noun

   deep-red cabochon garnet cut without facets
   type of:

   garnet

   any of a group of hard glassy minerals (silicates of various metals) used as gemstones and as an abrasive
2. noun

   an infection larger than a boil and with several openings for discharge of pus
   type of:

   staphylococcal infection

   an infection with staphylococcus bacteria; usually marked by abscess formation