Definition of white precipitate in English:

white precipitate

noun

rare
  • Any of various compounds of mercury occurring as white solids; (in later use) specifically (more fully "infusible white precipitate") mercury amide choride (HgNH₂Cl), which has a polymeric structure and has been used medicinally, and (more fully "fusible white precipitate") mercuric chloride diammoniate (Hg(NH₃)₂Cl₂).

Origin

Late 16th century; earliest use found in William Clowes (d. 1604), surgeon.