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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
“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


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Word History and Origins

Origin of bone ash1

First recorded in 1615–25
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Example Sentences

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

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

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

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.

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