Nitro-
Pronunciation : Ni"tro- (.
Definition : 1. A combining form or an adjective denoting the presence of niter.
2. (Chem.)
Defn: A combining form (used also adjectively) designating certain compounds of nitrogen or of its acids, as nitrohydrochloric, nitrocalcite; also, designating the group or radical NO2, or its compounds, as nitrobenzene. Nitro group, the radical NO2; -- called also nitroxyl.
Source : Webster's Unabridged Dictionary, 1913