bone ash

noun

1. a white ash obtained by calcining bones, used as a fertilizer and in the making of bone china.

bone ash

noun

1. 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

Word History and Origins

Origin of bone ash¹

First recorded in 1615–25

Example Sentences

Coprolites are seldom used alone for the manufacture of superphosphates, but are generally mixed with bone-ash and bone dust.

From Project Gutenberg

Bone-ash varies considerably in price, but of late samples containing 70 per cent of phosphates have sold as low as £4: 10s.

From Project Gutenberg

This is put in its place, and the cylinder filled (or nearly so) with the moistened bone ash.

From Project Gutenberg

The floor of the muffle is protected with a layer of bone-ash, which absorbs any oxide of lead that may be accidentally spilt.

From Project Gutenberg

The buttons are removed from the cupel with a pair of pliers and then brushed to remove adherent litharge and bone-ash.

From Project Gutenberg