noun (plural thesauri /-rʌɪ/ or thesauruses)
- 1A book that lists words in groups of synonyms and related concepts.More example sentences
- The thesaurus provides synonyms, antonyms and related words, and is accessed by just right-clicking on the word to be looked up, and selecting ‘Thesaurus’ from the menu.
- Use your word processor's thesaurus to find synonyms for ‘said’ and use them to convey a speaker's frame of mind or actions to the reader.
- Unlike a conventional thesaurus, this book concentrates on word groups, and not on individual words.
late 16th century: 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).