sulfamerazine
noun
sul·fa·mer·a·zine
variants:
or chiefly British sulphamerazine \ ˌsəl-fə-ˈmer-ə-ˌzēn 
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Medical Definition of sulfamerazine
: a sulfa drug C11H12N4O2S that is a derivative of sulfadiazine having one methyl group replacing a hydrogen and is used similarly