from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A black pigment containing about 10 percent charcoal, made by roasting bones in an airtight container and used in polishes, as a filtering medium, and in decolorizing sugar. Also called bone charcoal.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A preparation containing carbonized bone, used as a pigment and a filtering medium.
from the GNU version of the Collaborative International Dictionary of English
- n. See Bone black, under bone, n.
bone + black (Wiktionary)