Source : Webster's Revised Unabridged Dictionary (1913)

Anticlimax \An`ti*cli"max\, n. (Rhet.)
   A sentence in which the ideas fall, or become less important
   and striking, at the close; -- the opposite of climax. It
   produces a ridiculous effect.

   Note: Example:

               Next comes Dalhousie, the great god of war,
               Lieutenant-colonel to the Earl of Mar.

Source : WordNet®

anticlimax
     n 1: a disappointing decline after ad previous rise; "the
          anticlimax of a brilliant career"
     2: a change from a serious subject to a disappointing one [syn:
         {bathos}]