Arch. Pl. -oa. [a. Gr. τετράστοον, neuter of τετράστοος having four porticos (f. τετρα- + στοά porch).] A court-yard having open colonnades on each of its four sides.
1838. Britton, Art & Archæol. Mid. Ages, Tetrastoön,… a court-yard with porticos, or open colonnades on each of its four sides.
1908. W. M. Ramsay, in Expositor, Nov., 411. This atrium is what Eugenius calls a tetrastoon.
