The Collaborative International Dictionary of English v.0.48:

Nitrogenous \Ni*trog"e*nous\, a. (Chem.)
   Of, pertaining to, or resembling, nitrogen; as, a nitrogenous
   principle; nitrogenous compounds.
   [1913 Webster]

   Nitrogenous foods. See 2d Note under Food, n., 1.
      [1913 Webster] Nitroglycerin

WordNet (r) 3.0 (2006):

nitrogenous
    adj 1: of or relating to or containing nitrogen [syn:
           nitrogenous, nitrogen-bearing]