hart-shorn

hartshorn

[hahrts-hawrn]
noun
1.
the antler of a hart, formerly used as a source of ammonia.
2.
ammonium carbonate.

Origin:
before 1000; Middle English hertis horn, Old English heortes horn. See hart, 's1, horn

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World English Dictionary
hartshorn (ˈhɑːtsˌhɔːn)
 
n
an obsolete name for sal volatile
 
[Old English heortes horn hart's horn (formerly a chief source of ammonia)]

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