I.that is in the open air (post-Aug.): “inambulationes,” Plin. 14, 1, 3, § 11: “petrae,” id. 34, 12, 29, § 117.—As subst.: subdĭālĭa , ĭum, n., open galleries or terraces; a transl. of the Gr. ὑπαίθρια, ὕπαιθρα, Plin. 36, 25, 62, § 186.—Also in sing.: “subdival domus,” Tert. adv. Jud. 11.
sub-dĭālis (subdīvālis , Amm. 19, 11, 4), e, adj. dius,