Pericardium (noun)

1. A sac-like membrane that surrounds the heart and holds it in place.
2. A medical condition in which fluid collects in the pericardium and impairs the heart's ability to function.

Origin:

The word "pericardium" comes from the greek word "peri-" meaning "around" and "kardia" meaning "heart" and was first used in english in the 17th century.

Examples:

1. The pericardium is a double-walled sac that surrounds the heart and holds it in place.
2. Pericarditis is an inflammation of the pericardium that causes chest pain.
3. The pericardium protects the heart from infection and injury.
4. A pericardial effusion is a buildup of fluid in the pericardium which can impair the heart's function.
5. The surgery involves removing a small piece of pericardium to correct the problem.