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Roget’s II: The New Thesaurus   Third Edition
Containing 35,000 synonyms and over 250,000 cross-references in an easy-to-use format, this thesaurus features succinct word definitions and an innovative hyperlinked category index.
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Roget’s International Thesaurus of English Words and Phrases  C. O. Sylvester Mawson
Peter Roget’s classic structure coupled with Mawson’s modernization becomes even more user-friendly on Bartleby.com with 85,000 hyperlinked cross-references—thus fulfilling their goal of “each word being related to its neighbors and each part to the whole.” Additionally, over 2,900 proverbs and quotations from classic and modern authors illustrate the 1,000-plus entries.
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Thesaurus:

http://www.thesaurus.com/

--Roget's famed work is the basis for this online thesaurus.

http://www.m-w.com/

--Online version of Merriam-Webster's Collegiate Thesaurus.

http://dmoz.org/Reference/Thesauri/