'Thesaurus' definitions:

Definition of 'thesaurus'

From: WordNet
noun
A book containing a classified list of synonyms [syn: thesaurus, synonym finder]

Definition of 'Thesaurus'

From: GCIDE
  • Thesaurus \The*sau"rus\, n.; pl. Thesauri. [L. See Treasure.] A treasury or storehouse; hence, a repository, especially of knowledge; -- often applied to a comprehensive work, like a dictionary or cyclopedia. [1913 Webster]

Synonyms of 'thesaurus'

From: Moby Thesaurus