Peristalsis (noun)

1. The involuntary rhythmic contraction and relaxation of the muscles in the walls of a hollow organ, such as the esophagus or intestines, that propels the contents of the organ through it.
2. The rhythmic, muscular contractions that move food through the digestive tract, from the mouth to the anus.

Origin:

From new latin, from greek peristallein (περισταλλεῖν) "to contract" or "to ring aroun.d"

Examples:

1. Peristalsis is an important aspect of the digestive process.
2. The rhythmic contractions of peristalsis push food through the esophagus and into the stomach.
3. Peristalsis is the process that moves food along the digestive tract.
4. The muscles of the esophagus contract in a wave-like motion called peristalsis to propel the food toward the stomach.
5. Peristalsis is the movement of muscles in the digestive system that pushes food through the esophagus and stomach.