physiol the succession of waves of involuntary muscular contraction of various bodily tubes, esp of the alimentary tract, where it effects transport of food and waste products
[C19: from New Latin, from peri- + Greek stalsis compression, from stellein to press together]
1655, from Mod.L., from Gk. peristalikos (Galen), lit. "contracting around," from peri- (q.v.) + stalsis "checking, constriction," related to stellein "to put in order, draw together."