saprol

noun

1. (archaic, uncountable)A dark brown oily compound containing phenol, creosol, and other hydrocarbons such as coal tar products, used as a disinfectant.

   “The value of saprol as a disinfectant for human excreta has been investigated by Laser. It being lighter than water floats upon the surface of fluids which, from the supernatant layer dissolve phenol, cresol, and other coal-tar products which are soluble in water.”