[ thi-sawr-uhs ]
/ θɪˈsɔr əs /
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noun, plural the·sau·rus·es, the·sau·ri [-sawr-ahy]. /-ˈsɔr aɪ/.

a dictionary of synonyms and antonyms, such as the online Thesaurus.com.
any dictionary, encyclopedia, or other comprehensive reference book.
a storehouse, repository, or treasury.
  1. 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.
  2. a dictionary of synonyms and antonyms stored in memory for use in word processing.



Were you ready for a quiz on this topic? Well, here it is! See how well you can differentiate between the uses of "was" vs. "were" in this quiz.
Question 1 of 7
“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

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Origin of thesaurus

1730–40; <Latin thēsaurus<Greek thēsaurós ‘treasure, treasury’
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for thesaurus

British Dictionary definitions for thesaurus

/ (θɪˈsɔːrəs) /

noun plural -ruses or -ri (-raɪ)

a book containing systematized lists of synonyms and related words
a dictionary of selected words or topics
rare a treasury

Word Origin for thesaurus

C18: from Latin, Greek: treasure
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012