Precipitation n. Water that falls to the Earth's surface. 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
  • Ammonium sulfate precipitation, a method of purifying proteins
  • Basic precipitation, a type of precipitation characterized by high alkalinity
  • Ethanol precipitation, a method of concentrating DNA
  • Precipitation hardening, a method used to strengthen malleable materials
  • Protein precipitation, a method of separating contaminants from biological products