Definition of thesaurus noun from the Oxford Advanced American Dictionary

 

thesaurus

 noun
noun
NAmE//θɪˈsɔrəs//
 
(pl. thesauri
NAmE//θɪˈsɔraɪ//
 
or thesauruses
NAmE//θɪˈsɔrəsəz//
 
)
 
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a book that lists words in groups that have similar meanings
See the Oxford Advanced Learner's Dictionary entry: thesaurus

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