abdomen
Americannoun
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Anatomy, Zoology.
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the part of the body of a mammal between the thorax and the pelvis; belly.
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the cavity of this part of the body containing the stomach, intestines, etc.
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(in nonmammalian vertebrates) a region of the body corresponding to, but not coincident with, this part or cavity.
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Entomology. the posterior section of the body of an arthropod, behind the thorax or the cephalothorax.
noun
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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
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the front or surface of this region; belly
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(in arthropods) the posterior part of the body behind the thorax, consisting of up to ten similar segments
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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.
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In arthropods, the last, most posterior segment of the body.
Other Word Forms
Etymology
Origin of abdomen
1535–45; (< Middle French ) < Latin abdōmen belly
Explanation
Your abdomen is the middle part of the front of your body, between your chest area and your pelvis. If the doctor asks if your abdomen hurts, the doctor wants to know if you have any pain in your belly area. The word abdomen is also the name used for the cavity, enclosed by the abdominal muscles, that contains the organs in the abdominal area. The abdomen's contents in humans include your stomach, liver, spleen, small intestine, and kidneys. The word abdomen is sometimes shortened to abs, especially in infomercials and health clubs when referring to the muscles of your abdomen and how you should want flat ones.
Vocabulary lists containing abdomen
Gross, Anatomy!
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Counting by 7s
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Animals (Zoology) - Introductory
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Her treatment involved the removal of lymph nodes in her abdomen, although surgeons were able to preserve a small part of her cervix, giving her a chance of becoming pregnant.
From BBC ● Jun. 17, 2026
It builds up deep inside the abdomen and surrounds internal organs, and it has been strongly linked to serious conditions such as diabetes and heart disease.
From Science Daily ● May 7, 2026
The connection, Drew and his colleagues determined, is the vertebral venous plexus, a network of veins that connects the abdomen to the spine in mice and humans alike.
From Los Angeles Times ● May 7, 2026
The pressure is transmitted through the vertebral venous plexus, a network of veins linking the abdomen to the spinal cavity, which leads to slight brain movement.
From Science Daily ● May 1, 2026
By the end of the competition, he was feeling mild discomfort in the lower right part of his abdomen, and he was also having difficulty keeping food down.
From "Endgame" by Frank Brady
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
