What is the meaning of Dorsum?

The back or dorsal region on the surface of an animal.

The back of the tongue, used for articulating dorsal consonants.

The top of the foot or the back of the hand.

A ridge on a hill, or on the surface of a planet or moon.

Theta Capricorni, a star on the back of the Goat.

down, downwards, beneath, below; (motion/direction/order); in a lower situation

the back (part of the body between the neck and buttocks)

the ridge, summit of a hill, a reef in the sea; any elevation

alternative form of deorsum (“down”)

Source: wiktionary.org