The Collaborative International Dictionary of English v.0.48:

Hepar \He"par\, n. [L. hepar, hepatis, the liver, Gr. ?.]
   1. (Old Chem.) Liver of sulphur; a substance of a liver-brown
      color, sometimes used in medicine. It is formed by fusing
      sulphur with carbonates of the alkalies (esp. potassium),
      and consists essentially of alkaline sulphides. Called
      also hepar sulphuris.
      [1913 Webster]

   2. Any substance resembling hepar proper, in appearance;
      specifically, in homeopathy, calcium sulphide, called also
      hepar sulphuris calcareum (?).
      [1913 Webster]

   Hepar antimonii(Old Chem.), a substance, of a liver-brown
      color, obtained by fusing together antimony sulphide with
      alkaline sulphides, and consisting of sulphantimonites of
      the alkalies; -- called also liver of antimony.
      [1913 Webster]