sub-dĭālis (subdīvālis, Amm. 19, 11, 4), e, adj. [dius], 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.