ni·tro·mer·sol | \ -ˈmər-ˌsȯl 
, -ˌsōl \
, -ˌsōl \Medical Definition of nitromersol
: a brownish-yellow to yellow solid organic mercurial C7H5HgNO3 that is a derivative of orthocresol used especially formerly as an antiseptic and disinfectant
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