Flux n.
 1. The act of flowing; a continuous moving on or passing by, as of a flowing stream; constant succession; change.
    By the perpetual flux of the liquids, a great part of them is thrown out of the body.   --Arbuthnot.
 Her image has escaped the flux of things,
 And that same infant beauty that she wore
 Is fixed upon her now forevermore.   --Trench.
          Languages, like our bodies, are in a continual flux.   --Felton.
 2. The setting in of the tide toward the shore, -- the ebb being called the reflux.
 3. The state of being liquid through heat; fusion.
 4. Chem. & Metal. Any substance or mixture used to promote the fusion of metals or minerals, as alkalies, borax, lime, fluorite.
 Note: ☞ White flux is the residuum of the combustion of a mixture of equal parts of niter and tartar. It consists chiefly of the carbonate of potassium, and is white. -- Black flux is the ressiduum of the combustion of one part of niter and two of tartar, and consists essentially of a mixture of potassium carbonate and charcoal.
 5. Med. (a) A fluid discharge from the bowels or other part; especially, an excessive and morbid discharge; as, the bloody flux or dysentery. See Bloody flux. (b) The matter thus discharged.
 6. Physics The quantity of a fluid that crosses a unit area of a given surface in a unit of time.