Precipitant /(?)/

Pre·cip·i·tant

Precipitant

a.
  1. Falling or rushing headlong; rushing swiftly, violently, or recklessly; moving precipitately.
    They leave their little lives Above the clouds, precipitant to earth.
    — J. Philips.
    Should he return, that troop so blithe and bold, Precipitant in fear would wing their flight.
  2. Unexpectedly or foolishly brought on or hastened; rashly hurried; hasty; sudden; reckless.

Precipitant

n.
  1. Any force or reagent which causes the formation of a precipitate. (Chem.)