Source : Webster's Revised Unabridged Dictionary (1913)

Malodor \Mal*o"dor\, n.
   An Offensive to the sense of smell; ill-smelling. --
   {Mal*o"dor*ous*ness}. n. --Carlyle.

Source : WordNet®

malodor
     n : a distinctive odor that is offensively unpleasant [syn: {malodour},
          {stench}, {stink}, {reek}, {fetor}, {foetor}, {mephitis}]