dorsum
Dor"sum, n. Etym: [L.] 1. The ridge of a hill. 2. (Anat.) Defn: The back or dorsal region of an animal; the upper side of an appendage or part; as, the dorsum of the tongue.
Dor"sum, n. Etym: [L.] 1. The ridge of a hill. 2. (Anat.) Defn: The back or dorsal region of an animal; the upper side of an appendage or part; as, the dorsum of the tongue.