'Squealer' definitions:

Definition of 'squealer'

From: WordNet
noun
One who reveals confidential information in return for money [syn: informer, betrayer, rat, squealer, blabber]
noun
Domestic swine [syn: hog, pig, grunter, squealer, Sus scrofa]

Definition of 'Squealer'

From: GCIDE
  • Squealer \Squeal"er\ (-[~e]r), n.
  • 1. One who, or that which, squeals. [1913 Webster]
  • 2. (Zool.) (a) The European swift. (b) The harlequin duck. (c) The American golden plover. [1913 Webster]