What: wordnet
 Where: http://www.cogsci.princeton.edu/%7Ewn/ 
 Description: Online lexical reference system.
        A lexical database for the English language
 Updated: 07/1999
 Contact: mailto:wordnet@princeton.edu 


That is, a dictionary.

There is an online version [http://wordnet.princeton.edu/cgi-bin/webwn] and an off-line version [http://wordnet.princeton.edu/wn2.0.shtml]. The off-line version is avalable for [Windows] and [Unix].

It is mentioned here because it is based on Tcl/Tk. Don't expect too much. It works, but is rather poorly designed.

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