OXOPHENARSINE

ˌäksəfəˈnärˌsēn, -ärsə̇n noun

Etymology: ox- (I) + phen- + arsine

: an arsenical used in the form of its white powdery hydrochloride HOC 6 H 3 (AsO)NH 2 .HCl in the treatment of syphilis especially as an adjuvant to penicillin and Vincent's angina