THESAURUS

noun (plural thesauri or ~es) Etymology: New Latin, from Latin, treasure, collection, from Greek thēsauros Date: circa 1823 treasury , storehouse , 2. a book of words or of information about a particular field or set of concepts, a list of subject headings or descriptors usually with a cross-reference system for use in the organization of a collection of documents for reference and retrieval, thesaural adjective