# thesaurus

> English word · Noun · IPA /θɪˈsɔːɹəs/ · frequency rank #33,879

## Definitions
1. A publication that provides synonyms (and sometimes antonyms and other semantic relations) for the words of a given language.
2. A dictionary or encyclopedia.
3. A hierarchy of subject headings: canonical titles of themes and topics, the titles serving as search keys.

## 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.

## Common misspellings (13)
`htesaurus`, `tehsaurus`, `theasurus`, `thesaruus`, `thesaurrus`, `thesaursu`, `thesauruss`, `thesauurs`, `thessaurus`, `thesuarus`, `thhesaurus`, `thseaurus`, `tthesaurus`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/thesaurus