spirit of hartshorn: Meaning and Definition of

spir'it of harts'horn

Pronunciation: [key]
— Chem. Chem.
  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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.