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English definition of “peristalsis”

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noun [U] uk   /ˌper.ɪˈstæl.sɪs/ us    /-ˈstɑːl-/ specialized
the repeated movements made by the muscle walls in the digestive tract tightening and then relaxing that push food and waste through the body
(Definition of peristalsis from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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