Dictionaries - General
The American Heritage® Dictionary of the English Language (Fourth Edition)
Merriam-Webster Dictionary
Merriam-Webster Word Central (for children)
OneLook Dictionary Search (search 847 dictionaries at once)
Dictionaries - Specialized
Free Online Dictionary of Computing
Merriam-Webster Medical Dictionary
Patterweb: Early Modern English Dictionaries Database Search Utility
Thesauri
Merriam-Webster Thesaurus
Roget's Interactive Thesaurus
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