purgation
noun
[ pəːˈɡeɪʃ(ə)n ]
• purification or cleansing.
• "the purgation by ritual violence of morbid social emotions"
• evacuation of the bowels brought about by taking laxatives.
Origin:
late Middle English: from Old French purgacion, from Latin purgatio(n- ), from purgare ‘purify’ (see purge).