noun (plural thesauri or thesauruses)
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