Definition of thesaurus in English:

thesaurus

Line breaks: the|saurus
Pronunciation: /θɪˈsɔːrəs
 
/

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.
    Synonyms
    word finder, wordbook, synonym dictionary/lexicon
    rare synonymy
  • 1.1 archaic A dictionary or encyclopedia.

Origin

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).

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Word of the day coloratura
Pronunciation: ˌkələrəˈto͝orə
noun
elaborate ornamentation of a vocal melody