ob-vallo, āvi, ātum, 1, v. a., to surround with a wall or rampart; to fortify, intrench.
I Lit.: urbem, Paul. ex Fest. s. v. ob, p. 179 Müll.—*
II Trop.: locus omni ratione obvallatus. Cic. Agr. 2, 1, 3.