I recommend visiting the Project Gutenberg page at http://www.promo.net/pg/. You can download, I think, the 1923 Websters unabridged. It comes in HTML, if I remember correctly, and you can write short lisps or scripts to remove the pronunciations, definitions, etc. from the txt file.

I'm an ardent supporter of Project Gutenberg. Check it out and snag some of your favorite classics on computer for easy text searches.