Definition of precipitants:
(adj) :
Inclined to make rapid decisions without due consideration; hasty, impulsive, rash.
(adj) :
(chiefly figurative) Acting, happening, or moving quickly; fast, rapid, swift; also, abrupt, sudden, unexpected.
(n) :
Something which causes or hastens the occurrence of an act or event; specifically (chiefly psychology), something which brings about a mental or physiological condition.
(adj) :
Of a fall: straight downwards; headlong.
(adj) :
(chemistry) That causes precipitation (“formation of a heavier solid in a lighter liquid as a result of a chemical reaction”).
(n) :
(chemistry) A substance that, when added to a solution, causes a dissolved substance to form a precipitate.