The Collaborative International Dictionary of English v.0.48:

Defluxion \De*flux"ion\, n. [L. defluxio.] (Med.)
   A discharge or flowing of humors or fluid matter, as from the
   nose in catarrh; -- sometimes used synonymously with
   inflammation. --Dunglison.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

85 Moby Thesaurus words for "defluxion":
   affluence, afflux, affluxion, cascade, cataract, chute, collapse,
   comedown, concourse, confluence, conflux, course, crash,
   crosscurrent, current, debacle, declension, declination,
   descending, descension, descent, discharge, down, downbend,
   downcome, downcurve, downfall, downflow, downgrade, downpour,
   downrush, downtrend, downturn, downward trend, drain, drainage,
   drift, driftage, drop, dropping, effluence, efflux, effluxion,
   effusion, exhalation, exhaust, fall, falling, flow, flowing,
   flowoff, fluency, flux, gravitation, gush, inclination, inflow,
   mill run, millrace, onrush, onward course, outfall, outflow,
   outflowing, outpour, outpouring, plummeting, pounce, race, rapids,
   run, runoff, rush, set, spate, stoop, stream, surge, swoop, tide,
   trend, undercurrent, undertow, water flow, waterfall