dorsum

n. back

Dorsum (plural Dorsa) is a Latin word. In science, it could mean:Dorsum (biology), a term for an animal's backDorsum (astrogeology), a term used in astrogeology for a ridge[1]Theta Capricorni, a star on the back of the Goat (Capricornus)
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Dorsum /dor·sum/ pl. dor´sa [L.] 1. the back. 2. the aspect of an anatomical structure or part corresponding in position to the back; posterior in [more]Dorsum - Community and Resources

Noun
1. the posterior part of a human (or animal) body from the neck to the end of the spine; "his back was nicely tanned"
(synonym) back
(hypernym) body part
(part-holonym) torso, trunk, body
(part-meronym) saddle
2. the back of the body of a vertebrate or any analogous surface (as the upper or outer surface of an organ or appendage or part); "the dorsum of the foot"
(hypernym) body part

(n.)
The ridge of a hill.
  

(n.)
The back or dorsal region of an animal; the upper side of an appendage or part; as, the dorsum of the tongue.