The Collaborative International Dictionary of English v.0.48:

mercury bichloride \mercury bichloride\ n.
   the compound (HgCl2) consisting of two atoms of chlorine
   united with one atom of mercury. Also called bichloride of
   mercury, mercuric chloride, corrosive sublimate, and
   mercury perchloride. It is used as "a topical antiseptic
   and disinfectant for inanimate objects". --Stedman's 25th
   [PJC]