different between catastalsis vs catastasis

English

catastalsis (uncountable)

(biology) The rhythmic contraction and relaxation of the muscle of the intestines. It resembles ordinary peristalsis but is not preceded by a zone of inhibition.

From Ancient Greek ?????????? (katástasis, “settling, appointment”).

catastasis (countable and uncountable, plural catastases)

In classical drama, the third and penultimate section, in which action is heightened for the catastrophe.
(rhetoric) The part of a speech that states the subject to be discussed.

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