1. a jet or current of water, sometimes with a dissolved medicating or cleansing agent, applied to a body part, organ, or cavity for medicinal or hygienic purposes.
2. the application of such a jet.
3. an instrument, as a syringe, for administering it.
4. a bath administered by such a jet.
–verb (used with object)
5. to apply a douche to.
–verb (used without object)
6. to use a douche or douches; undergo douching.