Webster's English Dictionary

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flux

1. flux \'fl*ks\ n [ME, fr. MF & ML; MF, fr. ML fluxus, fr. L, flow, fr. 
   fluxus, pp. o]f fluere to flow - more at FLUID 1: a flowing of fluid from 
   the body; esp : an excessive abnormal di scharge from the bowels 2: a 
   continuous moving on or passing by (as of a stream)  3: a continued flow : 
   FLOOD  4a: INFLUX  4b: CHANGE, FLUCTUATION  5a: a substance used to promote 
   fusion esp. of metals or minerals  5b: a substance (as rosin) applied to 
   surfaces to be joined to clean and fr ee them from oxide and promote their 
   union 6: the rate of transfer of fluid, particles, or energy across a given 
   surfa ce
2. flux vt 1: to cause to become fluid  2: to treat with a flux  : to 
   become fluid : FUSE