Thesaurus meaning

thĭ-sôrəs
The definition of a thesaurus is a book or catalog words and their synonyms and antonyms.

An example of thesaurus is Roget's II: The New Thesaurus.

noun
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A book of selected words or concepts, such as a specialized vocabulary of a particular field, as of medicine or music.
noun
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A book of synonyms, often including related and contrasting words and antonyms.
noun
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A categorized index of terms for use in information retrieval, as from a computer.
noun
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A book containing a store of words; specif., a book of synonyms and antonyms.
noun
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A treasury or storehouse.
noun
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A publication, usually in the form of a book, that provides synonyms (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.

noun
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(archaic) A dictionary or encyclopedia.
noun
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(information science) A hierarchy of subject headings"”canonic titles of themes and topics, the titles serving as search keys.
noun
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Origin of thesaurus

  • Latin thēsaurus treasury from Greek thēsauros

    From American Heritage Dictionary of the English Language, 5th Edition

  • 16th century, from Latin thÄ“saurus, from Ancient Greek θησαυρός (thÄ“sauros, “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

    From Wiktionary