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See also: Thesaurus and thésaurus
For the Wiktionary thesaurus, see Wiktionary:Thesaurus


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16th century, 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.


  • IPA(key): /θɪˈsɔːɹəs/
  • (file)
  • Rhymes: -ɔːɹəs


thesaurus (plural thesauri or thesauruses)

  1. A publication, traditionally in the form of a book and now often online, 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. (archaic) A dictionary or encyclopedia.
  3. (information science) A hierarchy of subject headingscanonic titles of themes and topics, the titles serving as search keys.


Derived terms[edit]


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From Ancient Greek θησαυρός (thēsaurós, storehouse, treasure).



thēsaurus m (genitive thēsaurī); second declension

  1. treasure, hoard
    • 405, Jerome and others, Vulgate, Daniel 1:2
      [] et vasa intulit in domum thesauri dei sui
      " [] and he brought the vessels into the treasure house of his god."
  2. a dear friend, loved one
  3. a vault for treasure
  4. chest, strongbox
  5. repository, collection


Second-declension noun.

Case Singular Plural
Nominative thēsaurus thēsaurī
Genitive thēsaurī thēsaurōrum
Dative thēsaurō thēsaurīs
Accusative thēsaurum thēsaurōs
Ablative thēsaurō thēsaurīs
Vocative thēsaure thēsaurī

Derived terms[edit]



  • thesaurus”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • thesaurus”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • thesaurus in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
  • thesaurus in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette
  • thesaurus”, in Harry Thurston Peck, editor (1898) Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers
  • thesaurus”, in William Smith et al., editor (1890) A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin





thesaurus m (plural thesauri or thesaurus)

  1. thesaurus (dictionary of synonyms)
    Synonyms: tesauro, (Portugal) dicionário de sinónimos, (Brazil) dicionário de sinônimos