The abdomen has a prominent tubercle behind, at the end of the light spot, and under it in the middle line two others.
The Common Spiders of the United States|James Henry Emerton
This will allow the introduction of the hand into the abdomen from behind, so as to pull out the contents.
Special Report on Diseases of Cattle|U.S. Department of Agriculture
The legs are long and slender, the second pair longest, and the body is small and flat, and the abdomen pointed behind.
The Common Spiders of the United States|James Henry Emerton
It should be noticed whether the abdomen is normal or whether it is distended and hard.
American Red Cross Text-Book on Home Hygiene and Care of the Sick|Jane A. Delano
Berry drew the sheet down over Moira's abdomen as if it were an exceptionally fragile egg.
Special Delivery|Damon Francis Knight
British Dictionary definitions for abdomen
abdomen
/ (ˈæbdəmən, æbˈdəʊ-) /
noun
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
the front or surface of this region; bellyRelated adjective: coeliac
(in arthropods) the posterior part of the body behind the thorax, consisting of up to ten similar segments
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.
In arthropods, the last, most posterior segment of the body.