English Language Dictionaries

English:
Merriam-Webster's Collegiate Dictionary - Part of Encyclopaedia Britannica Online. It is a general, English-language dictionary that includes definitions, examples of use, pronunciations, etymologies, and synonyms.
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American Heritage Dictionary of the English Language - Over 90,000 entries feature 10,000 new words and senses, 70,000 audio word pronunciations, 900 full-page color illustrations, language notes and word-root appendixes.

Your Dictionary - Directory of online English dictionaries and thesauruses, translation dictionaries of 150 different languages, grammar help for 70 languages, and pages of linguistic fun

Online Etymology Dictionary - A free, well-referenced online dictionary of word origins.

Legal:
Find Law.com: Legal Dictionary:

Medical:
Medline Plus: Medical Dictionary:

Technology:
NetLingo.com - An entertaining and enlightening peek into the lexicon of the online world.

Sign Language:
American Sign Language Browser: From the Michigan State University Communication Technology Laboratory - this site features Quicktime video of thousands of signs.

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