The process of forming a chemical precipitate WordNet 3.0 & Open English WordNet

In an aqueous solution, precipitation is the process of transforming a dissolved substance into an insoluble solid from a supersaturated solution. Wikipedia

Chemical process leading to the settling of an insoluble solid from a solution Wikidata

The process of producing a separable solid phase within a liquid medium; represents the formation of a new condensed phase, such as a vapour or gas condensing to liquid droplets; a new solid phase gradually precipitates within a solid alloy as a result of slow, inner chemical reaction; in analytical chemistry, precipitation is used to separate a solid phase in an aqueous solution. OmegaWiki

A reaction that leads to the formation of a heavier solid in a lighter liquid; the precipitate so formed at the bottom of the container. Wiktionary