Dictionaries
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OneLook Dictionaries

Type in a word and search many dictionaries at once. Also has a reverse dictionary and translations.

Cambridge Dictionaries Online - Cambridge University Press

Free online dictionary from Cambridge University Press.

Dictionary and Thesaurus - Merriam-Webster Online

Free online dictionary, thesaurus, spanish-english and medical dictionaries, audio pronunciations, Word of the Day, word games, and many more high-quality Merriam-Webster language resources.