Source : Webster's Revised Unabridged Dictionary (1913)

Cacophony \Ca*coph"o*ny\, n.; pl. {Cacophonies}. [Gr. ?????????;
   ????? bad + ???? sound: cf. F. Cacophonie.]
   1. (Rhet.) An uncouth or disagreable sound of words, owing to
      the concurrence of harsh letters or syllables.
      ``Cacophonies of all kinds.'' --Pope.

   2. (Mus.) A combination of discordant sounds.

   3. (Med.) An unhealthy state of the voice.

Source : WordNet®

cacophony
     n 1: a loud harsh or strident noise [syn: {blare}, {blaring}, {clamor},
           {din}]
     2: loud confusing disagreeable sounds