PRECIP is another term for precipitation which means meteology (WEATHER) snow, sleet, rain, hail and other types of weather that includes water.
Precipitation is different amounts of water partials in clouds and then the clouds release them... so it's the the water particles being released by clouds. such as rain, sleet, snow, hail, ext.
Precipitation is the formation of asolid in a solution or inside another solid during a chemical reaction or by diffusionin a solid. When the reaction occurs in a liquid, the solid formed is called precipitate, and the liquid remaining above the solid is called the supernate. Powders derived from precipitation have also historically been known as flowers.