GNU Collaborative International Dictionary of English

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1.       
   nitro- () pref.
   1. A combining form or an adjective denoting the presence of niter.
   
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   2. (Chem.) A combining form (used also adjectively) designating certain compounds of nitrogen or of its acids; “nitrohydrochloric, nitrocalcite;” also, designating the group or radical NO2, or its compounds, as nitrobenzene (C6H5.NO2).
   
   [1913 Webster]
   
   Nitro group, the radical NO2; -- called also nitroxyl.
   
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