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