precipitate

n. [化学] 沉淀物

vt. 使沉淀；促成；猛抛；使陷入

vi. [化学] 沉淀；猛地落下；冷凝成为雨或雪等

adj. 突如其来的；猛地落下的；急促的

中文词源

precipitate 一头栽下，沉淀，凝结，降水，降雪

pre-,在前，-cip,头，词源同cap,captain,-ate,使。即使头在前，一头栽下，后用于气象术语，降水，降雪，引申物理术语沉淀，沉积，积灰，如Electrostatic Precipitator,电除尘器。

precipitate 鲁莽的，仓促的

pre-,在前，-cip,头，词源同cap,captain,-ate,形容词后缀。即使头在前的，一头栽下的，引申词义鲁莽的，仓促的。

precipitate (v.): "to hurl or fling down," 1520s, a back formation from precipitation or else from Latin praecipitatus, past participle of praecipitare "to throw or dive headlong," from praeceps "steep, headlong, headfirst" (see precipice). Meaning "to cause to happen, hurry the beginning of" is recorded from 1620s. Chemical sense is from 1620s; meteorological sense first attested 1863. Related: Precipitated; precipitating.
precipitate (adj.): c. 1600, from Latin praecipitatus, past participle of praecipitare "to throw or dive headlong" (see precipitate (v.)). Meaning "hasty" is attested from 1650s. Related: Precipitately.
precipitate (n.): 1560s, probably a back formation from precipitation.

1. pre- "before, forth" + cipit- + -ate.2. 本义为：头向前、朝前倾斜。很显然这会造成不稳定，进而导致摔倒、摔下、坠落，由此引申为：猛然摔下，坠落，又由此引申为沉淀。以及由头向前而表示的那种不沉稳之意，进而引申为：轻率、鲁莽、急促。

1. Adding sulphate to the solution will give a precipitate.: 将硫酸盐加入该溶液会产生沉淀.