Lewis Short
(adj.Subst.) = ὕπαιθρος: hypaethrus or -os, a, um, adj.
* That is in the open air, uncovered.
* Adj.: ambulationes,Vitr. 5, 9 med.: loca (with aperta),id. ib.
* Subst.
* Hy-paethros, i, m., a temple open or without roof, Vitr. 3, 2, 1.
* Hypaethrum, i, n., an open building, Dig. 33, 7, 12, § 20; id. 50, 16, 242, § 2.
* Hypaethra, ōrum, n., uncovered, open walks, Vitr. 1, 2.
Charlton T. Lewis, Charles Short, A Latin Dictionary