oxophenarsine
noun
oxo·phen·ar·sine
| \ ˌäk-sə-fen-ˈär-ˌsēn
, -sən
\
, -sən
\
Medical Definition of oxophenarsine
: an arsenical formerly used in the form of its hydrochloride C6H6AsNO2·HCl to treat syphilis