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. abdominal adjective (Äb-dÅm'É-nÉl)
Newcastle, California. Newcastle is an unincorporated community and census-designated place (CDP) in Placer County, California. Newcastle is located 8 miles (12.9 km) northeast of Rocklin. It is nestled in the Sierra Nevada foothills, 31 miles northeast of Sacramento.
The county is named after the English city of Newcastle. New Castle County has the highest population and population density of any Delaware county, and it is the smallest county in the state by area. It has more people than the other two counties, Kent and Sussex, combined.