halloo (n.)

  1. a shout to attract attention; he gave a great halloo but no one heard him'

    halloo (v.)

  1. urge on with shouts; halloo the dogs in a hunt'

  2. shout `halloo', as when greeting someone or attracting attention

The dictionary is based on the WordNet Electronic Lexical Database.
WordNet 3.0 Copyright 2011 by Princeton University. All rights reserved.