Thesaurus Definition

thĭ-sôrəs
thesauri, thesauruses
noun
thesauri, thesauruses
A treasury or storehouse.
Webster's New World
A book containing a store of words; specif., a book of synonyms and antonyms.
Webster's New World
A book of selected words or concepts, such as a specialized vocabulary of a particular field, as of medicine or music.
American Heritage
A categorized index of terms for use in information retrieval, as from a computer.
Webster's New World

(archaic) A dictionary or encyclopedia.

Wiktionary
Synonyms:
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Other Word Forms of Thesaurus

Noun

Singular:
thesaurus
Plural:
thesauri, thesauruses

Origin of Thesaurus

  • 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

  • Latin thēsaurus treasury from Greek thēsauros

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

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