Lewis & Short

sub-sōlānus, a, um, adj., lying beneath the sun, eastern, oriental (post-Aug.): montes, Plin. 7, 2, 2, § 24.
As subst.: subsō-lānus, i, m. (sc. ventus), the east wind, Sen. Q. N. 5, 16, 4; Plin. 2, 47, 46, § 119; Gell. 2, 22, 8; plur.: salubriores septentrionales quam subsolani vel austri sunt, Cels. 2, 1.