precipitant

名词 precipitant:

1. an agent that causes a precipitate to form

形容词 precipitant:

1. done with very great haste and without due deliberation
   同义词：hasty, overhasty, precipitate, precipitous

pre.cip.i.tant

adj.（形容词）
Rushing or falling headlong.
陡斜地冲下或落下的
Acting with or marked by impulsiveness in thought or action; rash.See Usage Note at precipitate
轻率的：在思想或行动上操之过急的或特点为冲动的；轻率的参见 precipitate
Abrupt or unexpected; sudden.
突如其来的：出其不意的或意外的；突然的
n.Chemistry （名词）【化学】
A substance that causes a precipitate to form when it is added to a solution.
沉淀剂：加入溶液中使沉淀物生成的物质

来源：
Latin praecipit3ns praecipitant- [present participle of] praecipit3re [to throw headlong] * see precipitate
拉丁语 praecipit3ns praecipitant- [] praecipit3re的现在分词 [陡斜地抛下] *参见 precipitate

【引伸】
precip.itantly
adv.（副词）