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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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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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