Lewis & Short

ancŏrālis, e, adj. [prob. ancora], of or pertaining to an anchor: strophia, App. M. 11, p. 265, 7.
Hence, ancŏrāle, is, n., a cable, Liv. 37, 30 fin.; so id. 22, 19; Plin. 16, 8, 13, § 34; cf. ancorarius.