English

Definition of thesaurus noun from the Oxford Advanced Learner's Dictionary

 

thesaurus

 noun
noun
BrE BrE//θɪˈsɔːrəs//
 
; NAmE NAmE//θɪˈsɔːrəs//
 
(pl. thesauri
BrE BrE//θɪˈsɔːraɪ//
 
; NAmE NAmE//θɪˈsɔːraɪ//
 
, thesauruses
BrE BrE//θɪˈsɔːrəsɪz//
 
; NAmE NAmE//θɪˈsɔːrəsɪz//
 
)
 
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a book that lists words in groups that have similar meanings I couldn’t find the word in the thesaurus. Word Origin late 16th cent.: via Latin from Greek thēsauros ‘storehouse, treasure’. The original sense ‘dictionary or encyclopedia’ was narrowed to the current meaning by the publication of Roget's Thesaurus of English Words and Phrases (1852).
See the Oxford Advanced American Dictionary entry: thesaurus

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