Internetworkers: http://www.ibiblio.org/internetworkers/

["Michael D. Thomas" <mdthomas AT mindspring.com>]

Just read that Google added synonym searching. Don't know when they added it,
though -- may be old news to some. It's not in the "Google Hacks" book, so it
hasn't been around forever.

You use the ~ operator to declare that you want to search for a term and its
synonyms.

http://www.google.com/help/refinesearch.html#tilde