dorsum
英 ['dɔːsəm]
美['dɔrsəm]
	    - n. 背部
 
英英释意
- 1. the posterior part of a human (or animal) body from the neck to the end of the spine;
 - "his back was nicely tanned"
 
- 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"