- Not to be confused with Dictionary.
(n.) A thesaurus is a book quite similar to a dictionary. It displays a group of words that have the same meaning; synonyms. It is not recommended for amateurs, as it is normally somewhat hard to use a thesaurus.
Using it in a sentence:
Go and get a thesaurus, I want to find out what synonyms the word 'cook' has.
Are you bringing your thesaurus to school tomorrow?