Carbúnculus, pen. cor. Diminut. Plat. A little cole: a certayne botch, comming of inflammation: a precious stone: a carbuncle: a faulte or blasting in vines: a hoate earth, burning all things sowed or set in it: an earth wherein is found black slates. Plin.
Lewis and Short: Latin dictionary
carbuncŭlus, i, m.dim. [1. carbo]. I.A small coal, Auct. Her. 4, 6, 9.—b.Trop., a burning or devouring sorrow: amburet ei misero corculum carbunculus. Plaut. Most. 4, 2, 70 Lorenz ad loc.—II.Meton.A.A kind of sandstone, red toph-stone, Varr. R. R. 1, 9, 2 Schneid.; Vitr. 2, 4; 2, 6; 8, 1; Plin. 17, 4, 3, 29; Pall. 1, 10, 1.—B.A reddish, bright kind of precious stone (prob. comprising the ruby, carbuncle, hyacinth, garnet, etc.), Plin. 37, 7, 25, 92 sq.; Isid. Orig. 16, 14, 1; Vulg. Exod. 28, 18; id. Ezech. 28, 13; Inscr. Orell. 2510.—Hence, ut scintillet probitas e carbunculis, i. e. be adorned with jewels, Publ. Syr. ap. Petr. 55 Bücheler. —C.A disease.1. Of men, a kind of tumor, a carbuncle, Cels. 5, 28, 1; 6, 18, 1; a disease in Gallia Narbonensis, le charbon provençal, Plin. 26, 1, 4, 5.—2. Of plants, a disease caused by hoar-frost, Col. 3, 2, 4; Plin. 18, 28, 68, 272; 18, 29, 70, 293.