A hernia occurs when there is a weakness or tear in your abdominal wall as a result of aging, injury, a previous surgical incision, or a condition present at birth. Hernias generally grow larger due to pressure on them, such as a loop of your intestine or fatty tissue pushing into the weak abdominal tissue or tear. The result is a sac that forms in the abdominal wall. You may or may not see a bulge at this point. As more abdominal contents push into the sac, a bulge will appear.
1 Used other than as an idiom: see outer ,â core. ( 2 planetology) The hot liquid material found near the centre of some planets, distinct from the solid inner core. ( 3 geology) The part of the Earth between the mantle and inner core, responsible for generating the planet's magnetic field. 4  Link/Cite.
physical system (Noun) The portion of the physical universe chosen for analysis, with everything outside the system known as the environment. Freebase (2.00 / 2 votes) Rate this definition: Physical system. In physics, the word system has a technical meaning, namely, it is the portion of the physical universe chosen for analysis. Everything outside the system is known as the environment, which in analysis is ignored except for its effects on the system.