Definition of precipitate noun from the Oxford Advanced Learner's Dictionary

BrE BrE//prɪˈsɪpɪteɪt//
; NAmE NAmE//prɪˈsɪpɪteɪt//
(chemistry) a solid substance that has been separated from a liquid in a chemical process A yellow precipitate should form immediately. See related entries: Molecules and matter
Word Originearly 16th cent.: from Latin praecipitat- ‘thrown headlong’, from the verb praecipitare, from praeceps, praecip(it)- ‘headlong’, from prae ‘before’ + caput ‘head’. The original sense of the verb was ‘hurl down, send violently’; hence ‘cause to move rapidly’, which gave rise to the current verb and noun senses (early 17th cent.).
See the Oxford Advanced American Dictionary entry: precipitate

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