Source : Webster's Revised Unabridged Dictionary (1913)

Amide \Am"ide\ (?; 277), n. [Ammonia + -ide.] (Chem.)
   A compound formed by the union of amidogen with an acid
   element or radical. It may also be regarded as ammonia in
   which one or more hydrogen atoms have been replaced by an
   acid atom or radical.

   {Acid amide}, a neutral compound formed by the substitution
      of the amido group for hydroxyl in an acid.

Source : WordNet®

amide
     n : any organic compound containing the group -CONH2