Precipitation may refer to: Precipitation (meteorology), rain, sleet, hail, snow and other forms of water falling from the sky Precipitation (chemistry), the condensation of a solid from a solution during a chemical reaction Precipitation (horse), a Thoroughbred racehorse Acid precipitation, a type of precipitation characterized by high acidity. Ammonium sulfate precipitation, a method of purifying proteins Ethanol precipitation, a method of concentrating DNA Precipitation strengthening,… (More on Precipitation)