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bone ash

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bone ash

–noun
a white ash obtained by calcining bones, used as a fertilizer and in the making of bone china.
Also called boneʹ earthʹ.


Origin:
1615–25
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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bone ash  
n.  The white, powdery calcium phosphate ash of burned bones, used as a fertilizer, in making ceramics, and in cleaning and polishing compounds.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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