the GNU version of the Collaborative International Dictionary of English
n. One who vilifies or defames.
The Century Dictionary and Cyclopedia
n. One who defames or traduces; a calumniator.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. one who attacks the reputation of another by slander or libel
Word Usage
"One night not long ago, over dinner with ten executives in the finance industry, I heard the president described as 'hostile to business,' 'anti-wealth,' and 'anti-capitalism'; as a 'redistributionist,' a 'vilifier,' and a 'thug.'"