The Collaborative International Dictionary of English v.0.48:

Nitrobenzene \Ni`tro*ben"zene\ (? or ?), n. [Nitro- + benzene.]
   (Chem.)
   A yellow aromatic liquid (C6H5.NO2), produced by the action
   of nitric acid on benzene, and called from its odor
   imitation oil of bitter almonds, or essence of mirbane.
   It is used in perfumery, and is manufactured in large
   quantities in the preparation of aniline. Fornerly called
   also nitrobenzol.
   [1913 Webster] Nitrobenzol

WordNet (r) 3.0 (2006):

nitrobenzene
    n 1: a poisonous oily water-soluble liquid used as a solvent and
         in the manufacture of aniline