douche (do?osh)n.1. a. A stream of water, often containing medicinal or cleansing agents, that is applied to a body part or cavity for hygienic or therapeutic purposes.b. A stream of air applied in a similar way.2. The application of a douche.3. An instrument for applying a douche.4. Vulgar Slang A foolish or contemptible person.v. douched, douch·ing, douch·es v.tr. To cleanse or treat by means of a douche.v.intr. To cleanse or treat oneself with a douche.[French, shower, from Italian doccia, conduit, back-formation from doccione, pipe, from Latin ducti?, ducti?n-, act of leading, from ductus, past participle of d?cere, to lead; see deuk- in Indo-European roots.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.douche (du??) n1. (Medicine) a stream of water or air directed onto the body surface or into a body cavity, for cleansing or medical purposes2. (Medicine) the application of such a stream of water or air3. (Medicine) an instrument, such as a special syringe, for applying a douche4. slang a contemptible personvb (Medicine) to cleanse or treat or be cleansed or treated by means of a douche[C18: from French, from Italian doccia, pipe; related to Latin ductus duct]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014douche (du?) n. 1. a jet or current of water, sometimes with a dissolved medicating or cleansing agent, applied to a body part or cavity for medicinal or hygienic purposes. 2. the application of such a jet. 3. an instrument, as a syringe, for administering it. v.t. 4. to apply a douche to. v.i. 5. to use a douche; undergo douching. [1675?85;