- a white ash obtained by calcining bones, used as a fertilizer and in the making of bone china.
Origin of bone ash
First recorded in 1615–25
Also called bone· earth·.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for bone ash
Formerly the test was lined with bone-ash; at present the hearth Cupelling.
The floor of the muffle is protected with a layer of bone-ash, which absorbs any oxide of lead that may be accidentally spilt.
The buttons are removed from the cupel with a pair of pliers and then brushed to remove adherent litharge and bone-ash.
When the bone-ash has been sufficiently compressed, the die is withdrawn, and the cupel removed from the ring.The Silversmith's Handbook
George E. Gee
Coprolites are seldom used alone for the manufacture of superphosphates, but are generally mixed with bone-ash and bone dust.Elements of Agricultural Chemistry
- the residue obtained when bones are burned in air, consisting mainly of calcium phosphate. It is used as a fertilizer and in the manufacture of bone china
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012