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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.
n. Chemistry
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.]

pre·cip′i·tant·ly adv.
References in periodicals archive ?
You'd think that a town known for its rain would do at least a few things precipitantly.
73) "The planet," he advised, "is falling precipitantly apart and coming reluctantly together at the very same moment.
When he leaves home, he does so precipitantly with a minimum of forethought or preparation.