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1. Rushing or falling headlong.
2. Acting with or marked by impulsiveness in thought or action; rash. See Usage Note at precipitate.
3. Abrupt or unexpected; sudden.
A substance that causes a precipitate to form when it is added to a solution.
[Latin praecipitāns, praecipitant-, present participle of praecipitāre, to throw headlong; see precipitate.]