/
flʌks/
n.
     - the action or process of flowing.
 - Medicine  an abnormal discharge of blood or other matter from or within the body. 
▸archaic diarrhoea or dysentery.
 - continuous change.
 - Physics  the amount of radiation, particles, etc. incident on or passing through an area in a given time. 
▸the total electric or magnetic field passing through a surface.
 - a substance mixed with a solid to lower the melting point, especially in soldering or smelting.
 
v.
 treat (a metal object) with a flux to promote melting.
Etymology
ME: from L. fluxus, from fluere ‘to flow’.