Definition of dorsa:
(n) :
(anatomy) The back or dorsal region on the surface of an animal.
(n) :
The top of the foot or the back of the hand.
(n) :
The back of the tongue, used for articulating dorsal consonants.
(n) :
(geology) A ridge on a hill, or on the surface of a planet or moon.
(n) :
(astronomy) Theta Capricorni, a star on the back of the Goat.