malodor

from WordNet (r) 3.0 (2006)

malodor
    n 1: a distinctive odor that is offensively unpleasant [syn:
         {malodor}, {malodour}, {stench}, {stink}, {reek}, {fetor},
         {foetor}, {mephitis}]

from The Collaborative International Dictionary of English v.0.48

malodor \mal*o"dor\, n.
   An offensive odor.
   [1913 Webster]

[email protected]