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thesaurus (noun) – 1. A book of synonyms, often including related and contrasting words and antonyms.
2. A book of selected words or concepts, such as a specialized vocabulary of a particular field, as of medicine or music.

Source : The Free Dictionary

Etymology : Late 16th century: via Latin from Greek th?sauros ?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).