Thesauruses
Oxford Reference Online brings together language and subject reference works from one of the world's biggest reference publishers into a single cross-searchable resource. Click “English Dictionaries and Thesauruses” to access the Oxford American Thesaurus of Current English and the Oxford Paperback Thesaurus.
Encarta Reference provides access to Encarta Encyclopedia, Encarta Online Deluxe, Encarta Atlas and Encarta World English Dictionary. Click “Dictionary” and then “Thesaurus.”
Full-text of the Merriam-Webster Collegiate Thesaurus found here, including synonyms, related words, antonyms, contrasted words, and idioms. Highlight the “Thesaurus” option in the main search box.
The Visual Thesaurus is an interactive dictionary and thesaurus which creates word maps that blossom with meanings and branch to related words.