noun, plural thesauruses, thesauri [-sawr-ahy] .
a dictionary of synonyms and antonyms, such as the online
any dictionary, encyclopedia, or other comprehensive reference book.
a storehouse, repository, or treasury.
an index to information stored in a computer, consisting of a comprehensive list of subjects concerning which information may be retrieved by using the proper key terms.
a dictionary of synonyms and antonyms stored in memory for use in word processing.

1730–40; < Latin thēsaurus < Greek thēsaurós ‘treasure, treasury’ Unabridged

online thesaurus

noun, plural online thesauruses, online thesauri.
a thesaurus or dictionary of words with the same or nearly the same meanings, or synonyms, and their opposites, or antonyms, such as, available on the Internet or the World Wide Web, accessed through a web browser, and used by entering a query term into a search box on the site. An online thesaurus provides immediate electronic access to lists of alternate terms for the queried word, covering its various shades of meaning: This online thesaurus showed me that smart, as an adjective, not only means intelligent, but also stylish, or lively, and gave long lists of other words for each meaning. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thesaurus (θɪˈsɔːrəs)
n , pl -ruses, -ri
1.  a book containing systematized lists of synonyms and related words
2.  a dictionary of selected words or topics
3.  rare a treasury
[C18: from Latin, Greek: treasure]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1823, "treasury, storehouse," from L. thesaurus "treasury, treasure," from Gk. thesauros "a treasure, treasury, storehouse, chest," from root of tithenai "to put, to place." The meaning "encyclopedia filled with information" is from 1840, but existed earlier as thesaurarie (1592), used as a title by
early dictionary compilers. Meaning "collection of words arranged according to sense" is first attested 1852 in Roget's title. Thesaur is attested in M.E. with the meaning "treasure" (15c.-16c.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Letting agencies are notoriously free and easy with the thesaurus.
Someone must have let him have access to a thesaurus and a bottle of whisky when he was already in an ungovernable rage.
In a thesaurus, the words themselves are the content.
Go beyond the mere thesaurus of deprecatory terms and tear me apart on substance.
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