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spirit of hartshorn

or spirits of hartshorn

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noun Chemistry.
  1. a colorless, pungent, suffocating, aqueous solution of about 28.5 percent ammonia gas: used chiefly as a detergent, for removing stains and extracting certain vegetable coloring agents, and in the manufacture of ammonium salts.
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Origin of spirit of hartshorn

First recorded in 1675–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018