(ăn″tĭ-pĕr″ĭ-stăl′sĭs)
[Pronunciation]
[″ + peri, around, + stalsis, constriction]

Reversed peristalsis; a wave of contraction in the gastrointestinal tract moving toward the oral end.
In the duodenum it is associated with vomiting; in the ascending colon it occurs normally.

See: peristalsis
antiperistaltic, (-stăl′tĭk)
[Pronunciation]
adj.