Precipitant

Webster's Dictionary of the English Language

·noun Any force or reagent which causes the formation of a precipitate.

II. Precipitant ·adj Unexpectedly or foolishly brought on or hastened; rashly hurried; hasty; sudden; reckless.

III. Precipitant ·adj Falling or rushing headlong; rushing swiftly, violently, or recklessly; moving precipitately.