Source : Webster's Revised Unabridged Dictionary (1913)

Amidogen \A*mid"o*gen\, n. [Amide + -gen.] (Chem.)
   A compound radical, {NH2}, not yet obtained in a separate
   state, which may be regarded as ammonia from the molecule of
   which one of its hydrogen atoms has been removed; -- called
   also the {amido group}, and in composition represented by the
   form amido.