Claustra | Webster's Dictionary of the English Language

claustra
claustra (clostra, Cato R. R. 13, 3; 135, 2), ōrum, n. (in sing.: claustrum, i, rare, Caes. Germ. ...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
claustra
claustra ōrum, n claudo, a lock, bar, bolt : revellere claustra: rumpere, V.: portarum, L.: sub cl...

An Elementary Latin Dictionary