Merriam-Webster is America's foremost publisher of language-related reference works. The company's site offers free online dictionary, thesaurus, audio pronunciations, Word of the Day, word games, and other English language resources. The site features the Webster's Collegiate, America's best-selling desk dictionary, including the main A-Z listing of the Collegiate Dictionary as well as the Abbreviations, Foreign Words and Phrases, Biographical Names, and Geographical Names sections of that book. It also includes 1,000 illustrations and 25 tables. Plus the site offers Spanish/English and medical dictionaries. Check it out, it's very resourceful.