thesauri

thesaurus

[thi-sawr-uhs]
noun, plural thesauruses, thesauri [-sawr-ahy] .
1.
a dictionary of synonyms and antonyms, such as the online Thesaurus.com.
2.
any dictionary, encyclopedia, or other comprehensive reference book.
3.
a storehouse, repository, or treasury.
4.
Computers.
a.
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.
b.
a dictionary of synonyms and antonyms stored in memory for use in word processing.

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

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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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Etymonline
Word Origin & History

thesaurus
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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