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3 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 ni·tro- pref.
 1. A combining form or an adjective denoting the presence of niter.
 2. Chem. 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 (C6H5.NO2).
 Nitro group, the radical NO2; -- called also nitroxyl.
 

From: Webster's Revised Unabridged Dictionary (1913)

 Ni·trox·yl n.  Chem. The group -NO2, usually called the nitro group.
 

From: WordNet (r) 2.0

 nitro group
      n : the group -NO3