thesaurus

A thesaurus is a book or catalog words and their synonyms and antonyms. (noun)

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

See thesaurus in Webster's New World College Dictionary

a treasury or storehouse
a book containing a store of words; specif., a book of synonyms and antonyms
a categorized index of terms for use in information retrieval, as from a computer

See thesaurus in American Heritage Dictionary 4

(thĭ-sôrˈəs)

noun pl. the·sau·ri (-sôrˈīˌ) or the·sau·rus·es

A book of synonyms, often including related and contrasting words and antonyms.
A book of selected words or concepts, such as a specialized vocabulary of a particular field, as of medicine or music.

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