catastalsis

[ kăt′ə-stôlsĭs, -stăl- ]

n.

A downward wave of contraction occurring in the gastrointestinal tract during digestion.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.