a black, carbonaceous substance obtained by calcining bones in closed vessels, used as a black pigment, a decolorizing agent, etc.
The Philippine Agricultural Review Various
a black residue from the destructive distillation of bones, containing about 10 per cent carbon and 80 per cent calcium phosphate, used as a decolorizing agent and pigment
a cell found in bone in any of its functional states; an osteoblast, osteoclast, or osteocyte. Historical Examples Embryology Gerald R. Leighton
a fine, naturally white china made with bone ash. Contemporary Examples Tallulah Bankhead: Gay, Drunk and Liberated in an Era of Excess Art Judith Mackrell January 24, 2014 noun porcelain containing bone ash