displuviate

[dis-ploo-vee-eyt]

adjective

(of the atrium of an ancient Roman house) having roofs sloping downward and outward from a central opening.

Origin of displuviate

< Latin displuviātus, equivalent to dis- dis-¹ + pluvi(a) rain + -ātus -ate¹

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

In the displuviate, there are beams which slope outwards, supporting the roof and throwing the rainwater off.
Ten Books on Architecture
Vitruvius
The roof of the displuviate atrium sloped from the middle toward the sides, the water being carried off by lead pipes.
Pompeii, Its Life and Art
August Mau