Source : Webster's Revised Unabridged Dictionary (1913)

Hartshorn \Harts"horn`\, n.
   1. The horn or antler of the hart, or male red deer.

   2. Spirits of hartshorn (see below); volatile salts.

   {Hartshorn plantain} (Bot.), an annual species of plantain
      ({Plantago Coronopus}); -- called also {duck's-horn}.
      --Booth.

   {Hartshorn shavings}, originally taken from the horns of
      harts, are now obtained chiefly by planing down the bones
      of calves. They afford a kind of jelly. --Hebert.

   {Salt of hartshorn} (Chem.), an impure solid carbonate of
      ammonia, obtained by the destructive distillation of
      hartshorn, or any kind of bone; volatile salts. --Brande &
      C.

   {Spirits of hartshorn} (Chem.), a solution of ammonia in
      water; -- so called because formerly obtained from
      hartshorn shavings by destructive distillation. Similar
      ammoniacal solutions from other sources have received the
      same name.