World English Dictionary
diastalsis (ˌdaɪəˈstælsɪs)
n , pl -ses
See also peristalsis a downward wave of contraction occurring in the intestine during digestion
[C20: New Latin, from dia- + (peri)stalsis]

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American Heritage
Medical Dictionary

diastalsis di·a·stal·sis (dī'ə-stôl'sĭs, -stāl'-)
Peristalsis in which a region of inhibition precedes the wave of contraction, as in the intestinal tract.

di'a·stal'tic (-stôl'tĭk, -stāl'-) adj.
The American Heritage® Stedman's Medical Dictionary
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