Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
mūrālis, e, adj. [murus], of or belonging to a wall, wall-, mural (class.): muralis herba, the pellitory of the wall, parietary, Plin. 21, 30, 104, § 176: pila, used in fighting from walls, Caes. B. G. 5, 39: tormentum, for battering walls, Verg. A. 12, 921: fossa, under the walls, Sil. 8, 555: falces, hooks for pulling down walls, Caes. B. G. 3, 14: corona, a mural crown, given as a reward to him who first scaled the enemy’s walls, Liv. 23, 18; also, corona, the crown on the head of Cybele, adorned with walls and towers, Lucr. 2, 606.