any of three isomeric compounds, CH(NO), formed by the reaction of nitric acid and benzene or nitrobenzene: used in dyes, organic synthesis, etc.
See dinitrobenzene in American Heritage Dictionary 4
noun
Any of three isomeric compounds, C6H4(NO2)2, made from a mixture of nitric acid, sulfuric acid, and heated benzene and used in celluloid manufacture, in dyes, and in organic synthesis.