Dorsum

·noun The ridge of a hill.

II. Dorsum ·noun The back or dorsal region of an animal; the upper side of an appendage or part; as, the dorsum of the tongue.

dorsum
dorsum, i, n. (masc. dorsus, Plaut. Mil. 2, 4, 44; quoted ap. Non. 203, 6) [cf. Gr. δειρή, δέρη, nec...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
dorsum
dorsum ī, n, or (old) dorsus, ī, m the back (of a beast of burden): Impositi dorso, on horseback, V...

An Elementary Latin Dictionary