ob-vallo

āvi, ātum, 1, v. a.
I. 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.
Lewis & Short
A Latin Dictionary, 1879
An open-access project