carbuncle

noun

Etymology: From Middle English carbuncle, charbocle, from Old French carbuncle, charbuncle, from Latin carbunculus (“a small coal; a reddish kind of precious stone; a kind of tumor”), diminutive of carbō (“a coal, charcoal”). Doublet of Garfinkel and Garfunkel.

1. A deep-red or fiery colored garnet or other dark red precious stone, especially when cut cabochon.

   “With eyes like carbuncles, the hellish Pyrrhus […]”

   “And I will make thy windows of agates, and thy gates of carbuncles, and all thy borders of pleasant stones.”

2. A charge or bearing supposed to represent the precious stone, with eight sceptres or staves radiating from a common centre; an escarbuncle.
3. An abscess larger than a boil, usually with one or more openings draining pus onto the skin. It is usually caused by staphylococcal infection.
4. An unpopular or ugly building; an eyesore.