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hartshorn

[hahrts-hawrn] /ˈhɑrtsˌhɔrn/
noun
1.
the antler of a hart, formerly used as a source of ammonia.
2.
ammonium carbonate.
Origin
1000
before 1000; Middle English hertis horn, Old English heortes horn. See hart, 's1, horn
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for hartshorn

hartshorn

/ˈhɑːtsˌhɔːn/
noun
1.
an obsolete name for sal volatile (sense 2)
Word Origin
Old English heortes horn hart's horn (formerly a chief source of ammonia)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for hartshorn
n.

"ammonium carbonate," Old English heortes hornes, from hart + horn (n.). So called because a main early source of ammonia was the antlers of harts.

Online Etymology Dictionary, © 2010 Douglas Harper
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