Thesaurus

·noun A treasury or storehouse; hence, a repository, especially of knowledge;

— often applied to a comprehensive work, like a dictionary or cyclopedia.

thesaurus
thēsaurus (old form thensaurus, Plaut. Trin. prol. p. ciii. Ritschl; cf. Marin. Fratr. Arv. p. 590...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
thesaurus
thēsaurus or thēnsaurus ī, m , θησαυρός, something laid up, a hoard, treasure, provision, store: pe...

An Elementary Latin Dictionary