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Dictionaries and Encyclopedias
Oxford English Dictionary
An essential tool for the study of the English language, providing definitions of words, along with illustrative quotations, throughout history
Search interface for a variety of Cambridge University Press language dictionaries. Includes English/Chinese (both traditional and simplified)
Provides links to linguistics sources--most important are the Encyclopedia of Applied Linguistics and the Encyclopedia of Bilingual Education.
Visual Dictionary Online
A thematic rather than alphabetical approach. Choose a theme like House and find words and illustrations about all aspects of that theme.