Pronunciation: (kär'bung-kul),[key] —n. 1. Pathol.a painful circumscribed inflammation of the subcutaneous tissue, resulting in suppuration and sloughing, and having a tendency to spread somewhat like a boil, but more serious in its effects.
2. a gemstone, esp. a garnet, cut with a convex back and a cabochon surface.
3. Also calledLondon brown. a dark grayish, red-brown color.
4. Obs.any rounded red gem.