Subdialis, & hoc subdiâle, pen. prod. Plin. Abrode in the aire without the house.Subdiales inambulationes. Plin. Open walkes.Subdialia pauimenta. Plin. Open allies paued to walke in.
Lewis and Short: Latin dictionary
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. u(pai/qria, u(/paiqra, Plin. 36, 25, 62, 186.—Also in sing.: subdival domus, Tert. adv. Jud. 11.