of, in, on, or for the abdomen: abdominal wall; abdominal pains.
Usually, abdominals. Informal. the abdominal muscles.

1740–50; < Latin abdōmin-, stem of abdōmen abdomen + -al1

abdominally, adverb
postabdominal, adjective
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World English Dictionary
abdomen (ˈæbdəmən, æbˈdəʊ-)
1.  the region of the body of a vertebrate that contains the viscera other than the heart and lungs. In mammals it is separated from the thorax by the diaphragm
2.  the front or surface of this region; bellyRelated: coeliac
3.  (in arthropods) the posterior part of the body behind the thorax, consisting of up to ten similar segments
Related: coeliac
[C16: from Latin; origin obscure]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1550s, from medical L. abdominalis, from abdomen (see abdomen). Abdominals short for "abdominal muscles" attested by 1980; colloquial shortening abs is attested by 1992.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
abdomen   (āb'də-mən)  Pronunciation Key 
  1. In vertebrates, the portion of the body between the thorax and pelvis, containing the stomach, intestines, liver, and other organs. In mammals, the abdomen is separated from the thorax by the diaphragm.

  2. In arthropods, the last, most posterior segment of the body.

abdominal adjective (āb-dŏm'ə-nəl)
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
He talks about fighting back the anxiety and abdominal pains, about his jangled
  nerves and wobbly legs.
Fidel, frail but back in action after his abdominal surgery, will try to block
  that process.
He survived the war, the camps and abdominal cancer that was carelessly treated.
The pump requires an electric cable, called a driveline, that runs through the
  abdominal wall to a battery pack in a harness.
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