3. Falling, flowing, or rushing, with steep descent; headlong.

Precipitate the furious torrent flows.

Prior.

4. Ending quickly in death; brief and fatal; as, a precipitate case of

disease. [Obs.] Arbuthnot.

Pre*cip"i*tate (?), n. [NL. praecipitatum: cf. F. prÈcipitÈ.] 1.

(Chem.) An insoluble substance separated from a solution in a concrete

state by the action of some reagent added to the solution, or of some

force, such as heat or cold. The precipitate may fall to the bottom

(whence the name), may be diffused through the solution, or may float

at or near the surface.

Red precipitate (Old. Chem), mercuric oxide (HgO) a heavy red

crystalline powder obtained by heating mercuric nitrate, or by heating

mercury in the air. Prepared in the latter manner, it was the

precipitate per se of the alchemists. -- White precipitate (Old Chem.)

(a) A heavy white amorphous powder (NH2.HgCl) obtained by adding

ammonia to a solution of mercuric chloride or corrosive sublimate; --

formerly called also infusible white precipitate, and now

amido-mercuric chloride. (b) A white crystalline substance obtained by

adding a solution of corrosive sublimate to a solution of sal ammoniac

(ammonium chloride); -- formerly called also fusible white precipitate.

Pre*cip"i*tate (?), v. t. [imp. & p. p. Precipitated (?); p. pr. & vb.

n. Precipitating.] 1. To throw headlong; to cast down from a precipice

or height.

She and her horse had been precipitated to the pebbled region of

the river.

W. Irving.

2. To urge or press on with eager haste or violence; to cause to

happen, or come to a crisis, suddenly or too soon; as, precipitate a

journey, or a conflict.

Back to his sight precipitates her steps.

Glover.

If they be daring, it may precipitate their designs, and prove

dangerous.

Bacon.

3. (Chem.) To separate from a solution, or other medium, in the form of

a precipitate; as, water precipitates camphor when in solution with

alcohol.

The light vapor of the preceding evening had been precipitated by

the cold.

W. Irving.

The Gutenberg Webster's Unabridged Dictionary: Section P and Q · 第 1299 / 2103 题