The Collaborative International Dictionary
Compluvium
Compluvium \Com*plu"vi*um\, n. [L.] (Arch.) A space left unroofed over the court of a Roman dwelling, through which the rain fell into the impluvium or cistern.
Wiktionary
compluvium
n. (context architecture English) A space left unroofed over the court of a dwelling in Ancient Rome, through which the rain fell into the impluvium or cistern.