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.
The Century Dictionary and Cyclopedia
noun.
A compound, C6H4 (NO2)2, derived from benzene by the substitution of two nitro-groups for two hydrogen atoms.