Mathematical Thesaurus 
Defines mathematical words and concepts, and indicates the links between them.
http://thesaurus.maths.org/
Phrase Finder 
Enter a single word and it will return a list of phrases and sayings that are related to the word in some way.
http://www.phrases.org.uk/
Thesaurus.com 
Searchable online version of Roget's Thesaurus of English words and phrases.
http://thesaurus.reference.com/
WWWebster Thesaurus 
Searchable online thesaurus from Merriam-Webster.
http://www.m-w.com/thesaurus.htm
Wordsmyth 
A dictionary and thesaurus in one. Also gives parts of speech and examples for more than 50,000 words.
http://www.wordsmyth.net/
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