Nitro group

from WordNet (r) 3.0 (2006)

nitro group
    n 1: the group -NO3

from The Collaborative International Dictionary of English v.0.48

nitro- \ni"tro-\pref.
   1. A combining form or an adjective denoting the presence of
      niter.
      [1913 Webster]

   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}).
      [1913 Webster]

   {Nitro group}, the radical {NO2}; -- called also {nitroxyl}.
      [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Nitroxyl \Ni*trox"yl\, n. [Nitro- + oxygen + -yl.] (Chem.)
   The group {-NO2}, usually called the {nitro group}.
   [1913 Webster]