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Dictionaries & Thesauri

Dictionary of American Regional English
Dictionary defines dialect and slang terms used in particular areas of the United States. Full electronic version will be available in 2013.
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Dictionary.com
Provides access to several online dictionaries and thesauri with one search. The source of definition is given after each entry.
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Encyberpedia
Find links to dictionaries, encyclopedias and glossaries on a wide variety of subjects, including science, literature, and religion. Scroll to the bottom of the page for foreign language dictionaries.
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Free Online Dictionary of Computing
This site supported by Imperial College Department of Computing offers more than 14,000 computing terms defined. Search for a specific term or hit the random key for a "random" definition.
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Law.com Dictionary
Easy to use dictionary of legal terms.
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Medline Plus Medical Dictionary
Authoritative, easy to use medical dictionary from the National Library of Medicine. Links to information about health topics, drugs, and nutritional supplements, as well as interactive tutorials and videos are available.
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Medline Plus Medical Encyclopedia
Medical encyclopedia from the National Institutes of Health "includes over 4,000 articles about diseases, tests, symptoms, injuries, and surgeries".
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Merriam-Webster Online
Find the perfect word. Link to a dictionary, thesaurus, medical dictionary, encyclopedia, or a Spanish-English dictionary.
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Roget's Thesaurus
Use this thesaurus to find words with similar meanings.
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Specialty Dictionaries
Specialized dictionaries for business, science, the arts, food and drink, hobbies, politics and more.
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Urban Dictionary
A collaborative dictionary featuring urban slang terms from A-Z.
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Whatis?com Computer Dictionary
Current definitions of thousands of information technology terms in categories from Hardware to Security, and a daily tech trivia quiz.
Added by KL