sulfarsphenamine
noun
sulf·ars·phen·a·mine
variants:
or chiefly British sulpharsphenamine \ ˌsəl-ˌfärs-ˈfen-ə-ˌmēn 
, -mən
\
, -mən
\
Medical Definition of sulfarsphenamine
: an orange-yellow powder C14H14As2N2Na2O8S2 formerly used to treat syphilis