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American Heritage Dictionary of the English Language
http://www.bartleby.com/61/
This huge dictionary includes more than 90,000 words, their definitions, and brief explanations of how many of the words are used in sentences.

American Sign Language Dictionary
http://www.masterstech-home.com/asldict.html
This dictionary has 1270 ASL terms with both animated and text definitions.

OneLook ®Dictionaries
http://www.onelook.com/index.html
Don't know which dictionary to use to find a word? This database of more than 2.8 million words in 680 general and specialized dictionaries will tell you which to use. Simply click on one of the links displayed, and repeat the search to find the meaning of the word.

Rhyming Dictionary
http://rhyme.lycos.com/
Dictionary of rhymes, synonyms, and more.

WWWebster Dictionary
http://www.m-w.com/dictionary.htm
This is the online counterpart to the 10th edition of the Merriam-Webster's Collegiate Dictionary. It provides definitions, synonyms, pronunciations, dates of origin, and parts of speech for words.

FOREIGN LANGUAGE DICTIONARIES:

Foreign Languages for
http://www.travlang.com/languages/
Learn how to count, tell time, shop, dine, find the airport, and ask for help in more than 70 languages from Azerbaijani to Zulu.

Internet Dictionary Project: Search the IDP
http://www.june29.com/IDP/IDPsearch.html
French, German, Italian, Portugese, and Spanish dictionaries online.

OTHER WORD BOOKS:

Acronym and Abbreviation List
http://www.ucc.ie/info/net/acronyms/index.html
Search by keyword or initials to find the meaning of abbreviations and acronyms.

ARTFL Project: ROGET'S Thesaurus Search Form
http://humanities.uchicago.edu/forms_unrest/ROGET.html
Use the ARTFL Project:Roget Form to search by phrase, keyword, or category for synonyms.

Merriam-Webster's Collegiate Thesaurus
http://www.m-w.com/thesaurus.htm
Use the search form to find synonyms for words.