Source : Webster's Revised Unabridged Dictionary (1913)

Condiment \Con"di*ment\, n. [L. condimentum, fr. condire. See
   {Condite}.]
   Something used to give relish to food, and to gratify the
   taste; a pungment and appetizing substance, as pepper or
   mustard; seasoning.

         As for radish and the like, they are for condiments,
         and not for nourishment.                 --Bacon.

Source : WordNet®

condiment
     n : a preparation (a sauce or relish or spice) to enhance flavor
         or enjoyment; "mustard and ketchup are condiments"