Origin: Latin prefix pre-
Precipitant has 4 different meanings across 2 categories:
an agent that causes a precipitate to form
A substance that forms a precipitate when added to a solution.
done with very great haste and without due deliberation
"hasty marriage seldom proveth well"
"hasty makeshifts take the place of planning"
"rejected what was regarded as an overhasty plan for reconversion"
"wondered whether they had been rather precipitate in deposing the king"
That falls headlong, or causes a headlong fall.