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Thesaurus.com - http://thesaurus.reference.com/
Searchable online version of Roget's Thesaurus of English words and phrases. |
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Wordsmyth - http://www.wordsmyth.net/
A dictionary and thesaurus in one. Also gives parts of speech and examples for more than 50,000 words. |
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Roget's II - The New Thesaurus - http://www.bartleby.com/62/
Contains 35,000 synonyms, succinct word definitions and a hyperlinked category index. |
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Mathematical Thesaurus - http://thesaurus.maths.org/
Defines mathematical words and concepts, and indicates the links between them. |
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Roget's International Thesaurus of English Words and Phrases - http://www.bartleby.com/110/
85,000 hyperlinked cross-references, plus proverbs and quotations from classic and modern authors. |