blowdown

Etymology
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Noun

 * 1)  The removal of liquid and solid hydrocarbons from a refinery vessel by the use of pressure.
 * 2)  Cooling fluid discharged from a plant at the end of its cycle.
 * 3)  Uprooting, overtopping, or bole breakage of trees by the wind; windthrow and windsnap.
 * 4)  The action of aerodynamic forces to tend to cause a deflected control surface to return to its neutral position, or prevent the surface from deflecting past a certain point.
 * 5)  An instance of blowing down with compressed air.
 * 1)  An instance of blowing down with compressed air.
 * 1)  An instance of blowing down with compressed air.