Compluvium

·noun A space left unroofed over the court of a Roman dwelling, through which the rain fell into the impluvium or cistern.

compluvium
complŭvĭum, ii, n. [compluit, I.], I a quadranguiar open space in the middle of a Roman house , whi...

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