'Harasser' definitions:

Definition of 'harasser'

From: WordNet
noun
A persistent tormentor
noun
A persistent attacker; "the harassers were not members of the regular army" [syn: harasser, harrier]

Definition of 'Harasser'

From: GCIDE
  • Harasser \Har"ass*er\ (-[~e]r), n. One who harasses. [1913 Webster]