bibliothecarius

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.

biblĭŏthēcārĭus, ii, m. [bibliotheca],

a librarian (late Lat.), M. Aurel. ap. Fronto Ep. ad M. Caes. 4, 5: bibliothecarius qui codices servat, Gloss. Isid.