dichlorophenarsine

noun
di·​chlo·​ro·​phen·​ar·​sine | \ -fen-ˈär-ˌsēn, -ˌär-ˈsēn How to pronounce dichlorophenarsine (audio) \

Medical Definition of dichlorophenarsine

: an arsenical formerly used in the form of its white powdery hydrochloride C6H6AsCl2NO·HCl in the treatment of syphilis