An appliance designed to wash something out.
The cleaning of matter from a physiological system using a fluid.
A period between clinical treatments in which any medication delivered as the first treatment is allowed to wash out of the person before the second treatment begins.
The action whereby falling rainwater clean particles from the air.
A channel produced by the erosion of a relatively soft surface by a sudden gush of water.
A breach in a road or railway caused by flooding.
The cleaning of the inside of a (locomotive) boiler to remove scale (limescale).
A disappointment or total failure; an unsuccessful person.
A sporting fixture or other event that could not be completed because of rain.
The aerodynamic effect of a small twist in the shape of an aircraft wing