What do a.m. and p.m. stand for?


[dawr-suh m] /ˈdɔr səm/
noun, plural dorsa
[dawr-suh] /ˈdɔr sə/ (Show IPA).
Anatomy, Zoology
the back, as of the body.
the back or outer surface of an organ, part, etc.
Origin of dorsum
1775-85; < Latin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Examples from the web for dorsum
  • 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.
British Dictionary definitions for dorsum


noun (anatomy) (pl) -sa (-sə)
a technical name for the back1
any analogous surface: the dorsum of the hand
Word Origin
C18: from Latin, literally: back
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
dorsum in Medicine

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.
Cite This Source

Word of the Day

Difficulty index for dorsum

Some English speakers likely know this word

Word Value for dorsum

Scrabble Words With Friends