'Libeler' definitions:

Definition of 'libeler'

(from WordNet)
noun
One who attacks the reputation of another by slander or libel [syn: defamer, maligner, slanderer, vilifier, libeler, backbiter, traducer]

Definition of 'Libeler'

From: GCIDE
  • Libeler \Li"bel*er\ (-[~e]r), n. One who libels. [Written also libeller.] " Libelers of others." --Buckminster. [1913 Webster]