Definition of peristalsis noun from the Oxford Advanced Learner's Dictionary

 

peristalsis

 noun
noun
BrE BrE//ˌperɪˈstælsɪs//
 
; NAmE NAmE//ˌperɪˈstælsɪs//
 
[uncountable](biology)
 
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the wave-like movements of the intestine, etc. caused when the muscles contract and relax Word Origin mid 19th cent.: modern Latin, from Greek peristallein ‘wrap around’, from peri- ‘around’ + stallein ‘to place’.
See the Oxford Advanced American Dictionary entry: peristalsis