The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

         As for radish and the like, they are for condiments,
         and not for nourishment.                 --Bacon.
   [1913 Webster]

WordNet (r) 3.0 (2006):

condiment
    n 1: a preparation (a sauce or relish or spice) to enhance
         flavor or enjoyment; "mustard and ketchup are condiments"