The Collaborative International Dictionary of English v.0.48:

Douche \Douche\, n. [F., fr. It. doccia, fr. docciare to flow,
   pour, fr. an assumed LL. ductiare, fr. L. ducere, ductum, to
   lead, conduct (water). See Duct.]
   1. A jet or current of water or vapor directed upon some part
      of the body to benefit it medicinally; a douche bath.
      [1913 Webster]

   2. (Med.) A syringe.
      [1913 Webster]

WordNet (r) 3.0 (2006):

douche
    n 1: a small syringe with detachable nozzles; used for vaginal
         lavage and enemas [syn: douche, douche bag]
    2: irrigation with a jet of water or medicated solution into or
       around a body part (especially the vagina) to treat
       infections or cleanse from odorous contents
    v 1: direct a spray of water into a bodily cavity, for cleaning

Moby Thesaurus II by Grady Ward, 1.0:

147 Moby Thesaurus words for "douche":
   Finnish bath, Japanese bath, Russian bath, Swedish bath,
   Turkish bath, ablution, aerosol, asperge, aspergil, aspergillum,
   atomizer, baptize, bath, bathe, bedew, bespatter, besprinkle, brew,
   cleaning out, clyster, cold shower, concentrate sprayer, dabble,
   damp, dampen, dash, dew, douching, drench, drouk, elution,
   elutriation, enema, flush, flush out, flushing, flushing out,
   fountain syringe, gargle, hip bath, holystone, hose, hose down,
   humect, humectate, humidify, hummum, imbrue, imbue, impregnate,
   infiltrate, infuse, inject, irrigate, irrigation, lather,
   lathering, launder, lavabo, lavage, lavation, lave, laving, leach,
   lixiviate, macerate, mist concentrate sprayer, moisten, mop,
   mop up, mopping, mopping up, needle bath, nozzle, paddle,
   percolate, permeate, plunge bath, rinse, rinse out, rinsing,
   ritually immerse, saturate, sauna, sauna bath, scour, scouring,
   scrub, scrub up, scrubbing, scrubbing up, seethe, shampoo, shower,
   shower bath, shower head, sitz bath, slobber, slop, slosh, sluice,
   sluice out, soak, soap, soaping, sodden, sop, souse, sparge,
   sparger, spatter, splash, splatter, sponge, sponge bath, sponging,
   spray, spray can, sprayer, sprinkle, sprinkler, sprinkler head,
   sprinkling system, steep, swab, swabbing, swash, sweat bath,
   syringe, toivel, tub, wash, wash out, wash up, washing, washing up,
   washout, washup, water, watercart, watering can, watering pot,
   waterlog, wet, wet down, whirlpool bath, wiping up