thesaurus: Meaning and Definition of

the•sau•rus

1. a dictionary of synonyms and antonyms.
2. any dictionary, encyclopedia, or other comprehensive reference book.
3. a storehouse, repository, or treasury.
1. an index to information stored in a computer, consisting of a comprehensive list of subjects concerning which information may be retrieved by using the proper key terms.
2. a dictionary of synonyms and antonyms stored in memory for use in word processing.