Entry 1 sense Webster, 1913 Nitrogenous /nīt-räj'-ən-əs/ · Ni·trog·e·nous · IPA /naɪtrˈɑdʒənəs/ 01 a. Of, pertaining to, or resembling, nitrogen; as, a nitrogenous principle; nitrogenous compounds. 1. Of, pertaining to, or resembling, nitrogen; as, a nitrogenous principle; nitrogenous compounds.(Chem.) Phrases & compounds Nitrogenous foods — See 2d Note under Food, n., 1.