Definition of peristalsis noun from the Oxford Advanced American Dictionary

 

peristalsis

 noun
noun
NAmE//ˌpɛrəˈstɔlsəs//
 
, NAmE//ˌpɛrəˈstɑlsəs//
 
, NAmE//ˌpɛrəˈstælsəs//
 
[uncountable](biology)
 
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the wave-like movements of the intestine, etc. caused when the muscles contract and relax
See the Oxford Advanced Learner's Dictionary entry: peristalsis