impairer

from WordNet (r) 3.0 (2006)
impairer
    n 1: an agent that impairs; "crops can be great impairers of the
         soil"
    
from The Collaborative International Dictionary of English v.0.48
Impairer \Im*pair"er\, n.
   One who, or that which, impairs.
   [1913 Webster]
    

[email protected]