noun, plural dorsa [dawr-suh] . Anatomy, Zoology.
the back, as of the body.
the back or outer surface of an organ, part, etc.

1775–85; < Latin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dorsum (ˈdɔːsəm)
n , pl -sa
1.  a technical name for the back
2.  any analogous surface: the dorsum of the hand
[C18: from Latin, literally: back]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

dorsum dor·sum (dôr'səm)
n. pl. dor·sa (-sə)

  1. The back.

  2. The upper, outer surface of an organ, an appendage, or a part.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
They are thickly distributed over the anterior two-thirds of its dorsum, giving to this surface its characteristic roughness.
Dorsum of eighth abdominal segment with unpaired hump.
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