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1. The antler of a hart, formerly used as a source of ammonia and in smelling salts.
2. See ammonium carbonate.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Elements & Compounds) an obsolete name for sal volatile2
[Old English heortes horn hart's horn (formerly a chief source of ammonia)]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. the antler of a hart, formerly used as a source of ammonia.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
At one time, shavings from a horn of a Hart. By the early twentieth century, spirits of hartshorn meant an aqueous solution of ammonia, and salt of hartshorn was an impure ammonium carbonate. By the late 1930s, “salt” had been dropped and hartshorn generally meant ammonium carbonate.
1001 Words and Phrases You Never Knew You Didn’t Know by W.R. Runyan Copyright © 2011 by W.R. Runyan