The Oxford English Dictionary (OED) is widely regarded as the accepted authority on the English language. It is an unsurpassed guide to the meaning, history, and pronunciation of 600,000 words— past and present—from across the English-speaking world.
As a historical dictionary, the OED is very different from dictionaries of current English, in which the focus is on present-day meanings. You’ll still find present-day meanings in the OED, but you’ll also find the history of individual words, and of the language—traced through 3 million quotations, from classic literature and specialist periodicals to film scripts and cookery books. --Website
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Oxford Reference Online
Resource of reference materials such as dictionary, language reference, and subject reference works published by Oxford University Press. Provides database-wide searching, subject searching across sources, and individual title searching.
eBooks (Gale)
Search across subject-specific reference encyclopedias.
Credo Reference
Access to general and subject-specific reference books (encyclopedias, dictionaries, thesauri and books of quotations and proverbs). Provides a graphics-based Concept Mapping option for topic exploration.