the world > the earth > weather and the atmosphere > weather > precipitation or atmospheric moisture > rain > [noun] > removal of particles from air by rain (2)
rainout1954
The incorporation of polluting substances in the atmosphere (originally, radioactive debris from a nuclear explosion) into raindrops as they form…
wash-out1955
Meteorology. The removal of particles from the air by falling water droplets. Cf. rainout, n. 2.