1766, "jet of water or current applied to some part of the body," from French douche (16c.), from Italian doccia "shower," from docciare "to spray," from Latin ductionem "a leading" (from ducere "to lead," from PIE root *deuk- "to lead"). The sense in reference to vaginal cleansing is by 1833. The verb is attested by 1838. Related: Douched; douching.
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