What is the meaning of Carbuncle?

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

A charge or bearing supposed to represent the precious stone, with eight sceptres or staves radiating from a common centre; an escarbuncle.

An abscess larger than a boil, usually with one or more openings draining pus onto the skin. It is usually caused by staphylococcal infection.

An unpopular or ugly building; an eyesore.

A carbuncle (garnet or other precious stone)

Material similar to carbuncle.

A carbuncle; a large abscess.

carbuncle (deep-red or fiery colored garnet or other dark red precious stone)

Source: wiktionary.org