Dorsum

noun

1. The back of the tongue, used for articulating dorsal consonants.
2. The top of the foot or the back of the hand.
3. The back or dorsal region on the surface of an animal.
4. (astrogeology) A ridge on a hill, or on the surface of a planet or moon.
5. Theta Capricorni, a star on the back of the Goat