precipitation; the settling of solid particles to the bottom of a liquid (a precipitate); used in chemistry and related fields. Can be used as a verb (to precipitate, to settle).
試験管の底に黒い沈殿ができた。
A black precipitate formed at the bottom of the test tube.
溶液をしばらく静置すると沈殿が沈んで分離する。
If you let the solution sit for a while, the precipitate will settle and separate.
遠心分離で沈殿を回収した。
We recovered the precipitate by centrifugation.