Thesaurus

//θɪˈsɔːɹəs// noun

noun ·Uncommon ·College level

Definitions

Noun
  1. 1
    A publication that provides synonyms (and sometimes antonyms and other semantic relations) for the words of a given language.

    ""Roget" is the leading brand name for a print English thesaurus that lists words under general concepts rather than just close synonyms."

  2. 2
    a book containing a classified list of synonyms wordnet
  3. 3
    A dictionary or encyclopedia. archaic
  4. 4
    A hierarchy of subject headings: canonical titles of themes and topics, the titles serving as search keys.

Synonyms

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dictionaryarmoryarsenalbiographical dictionarycachechemical dictionary

Example

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"What's another word for 'thesaurus'?"

Etymology

16th century, borrowed from Latin thēsaurus, from Ancient Greek θησαυρός (thēsaurós, “storehouse, treasure”); its current English usage/meaning was established soon after the publication of Peter Roget's Thesaurus of English Words and Phrases in 1852. Doublet of treasure.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.