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 (/).-any substance resembling hepar proper, in appearance; specifically, in homeopathy, calcium sulphide, called also hepar sulphuris calcareum (/).