ˈperəˌstīl noun
Etymology: French péristyle, from Latin peristylum, from Greek peristylon, peristylos, from neuter & masculine respectively of peristylos, adjective, surrounded by a colonnade, from peri- + stylos pillar — more at steer
1. : a colonnade surrounding a building or court ; specifically : a range of roof-supporting columns together with their entablature on all sides of a building (as the cella of a temple) or an inner court
2. : an open space enclosed by a colonnade (as the larger and inner court of a Roman dwelling) — compare atrium