noun \thi-ˈsr-əs\

: a book in which words that have the same or similar meanings are grouped together

plural the·sau·ri\-ˈsr-ˌī, -ˌē\ or the·sau·rus·es\-ˈsr-ə-səz\

Full Definition of THESAURUS

a :  a book of words or of information about a particular field or set of concepts; especially :  a book of words and their synonyms
b :  a list of subject headings or descriptors usually with a cross-reference system for use in the organization of a collection of documents for reference and retrieval
the·sau·ral \-ˈsr-əl\ adjective


New Latin, from Latin, treasure, collection, from Greek thēsauros
First Known Use: circa 1823


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