carbuncle

plural carbuncles

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

   With eyes like carbuncles, the hellish Pyrrhus […]

   1602, William Shakespeare, Hamlet, act II, scene 2, line 401

   4 more examples

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

   1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], →OCLC, Isaiah 54:12

   His turban, or mandil [mandīl], was of finest white silk interwoven with gold, bestudded with pearl[s] and carbuncles; […]

   1634, Thomas Herbert, A Relation of Some Yeares Trauaile, Begunne Anno 1626. Into Afrique and the Greater Asia, especially the Territories of the Persian Monarchie: And some Parts of the Orientall Indies, and Iles Adiacent. Of their Religion, Language, Habit, Discent, Ceremonies, and other Matters Concerning Them: Together with the Proceedings and Death of the Three Late Ambassadours: Sir D. C[otton] Sir R. S[herley] and the Persian Nogdi-Beg: As also the Two Great Monarchs, the King of Persia, and the Great Mogol, London: William Stansby for Iacob Bloome, →OCLC; republished as William Foster, editor, Travels in Persia 1627–1629. Abridged and Edited by Sir William Foster … with an Introduction and Notes (Broadway Travellers), London: G. Routledge & Sons, 1928, →OCLC, page 79

   These are usually represented as short and stumpy with shaggy hair, dark wrinkled faces, little deep-set eyes, but bright as carbuncles.

   1850, Thomas Keightley, The Fairy Mythology, London: H.G. Bohn, page 432

   A piece of marigold or bay leaf was imbedded in the metal, and over it a carbuncle or chrysolite was placed.

   1936, Rollo Ahmed, The Black Art, London: Long, page 155

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