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Merriam Webster Unabridged Dictionary Online This database is the electronic version of Webster's Third New International Dictionary, Unabridged. This dictionary contains over 472,000 entries and 140,000 etymologies describing word origins.
Oxford English Dictionary (OED)
The Oxford English Dictionary is the standard authority on the etymology and evolution of the English language.
Oxford Reference (gateway)
Dictionaries, encyclopedias, and companions for many subject areas, especially the humanities, but also social sciences, sciences, and business.