- 1 English
- 2 Latin
- 3 Portuguese
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
- A publication, usually in the form of a book, that provides synonyms (and sometimes antonyms) 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.
- (archaic) A dictionary or encyclopedia.
- (information science) A hierarchy of subject headings — canonic titles of themes and topics, the titles serving as search keys.
- thesaurus in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.
- thesaurus in The Century Dictionary, The Century Co., New York, 1911
- Roget's Thesaurus can be found at: https://web.archive.org/web/20051125170203/http://www.bartleby.com/thesauri/
- (Classical) IPA(key): /tʰeːˈsau̯.rus/, [tʰeːˈsau̯.rʊs]
- (Ecclesiastical) IPA(key): /teˈsau̯.rus/, [teˈzau̯.rus]
- treasure, hoard
- a dear friend, loved one
- a vault for treasure
- chest, strongbox
- repository, collection
- Catalan: tesaurus, tresor
- → English: thesaurus, treasure
- French: thésaurus, trésor
- Italian: tesauro, tesoro
- 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, 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