pre·cip·i·tate /prɪˈsɪpəˌtet/
 沈澱物(vt.)猛拋,使陷入,促成,使沈澱(vi.)猛地落下(a.)猛地落下的,急躁的


 pre·cip·i·tate /prɪˈsɪpəˌtet/ 動詞
 沉澱物,製備的,精製的,使沉澱


 Pre·cip·i·tate a.
 1. Overhasty; rash; as, the king was too precipitate in declaring war.
 2. Lacking due deliberation or care; hurried; said or done before the time; as, a precipitate measure. “The rapidity of our too precipitate course.”
 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.]


 Pre·cip·i·tate n.  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.


 Pre·cip·i·tate, v. i.
 1. To dash or fall headlong. [R.]
    So many fathom down precipitating.   --Shak.
 2. To hasten without preparation. [R.]
 3. Chem. To separate from a solution as a precipitate. See Precipitate, n.

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 precipitate
      adj : done with very great haste and without due deliberation;
            "hasty marriage seldom proveth well"- Shakespeare;
            "hasty makeshifts take the place of planning"- Arthur
            Geddes; "rejected what was regarded as an overhasty
            plan for reconversion"; "wondered whether they had been
            rather precipitate in deposing the king" [syn: hasty,
             overhasty, precipitant, precipitous]
      n : a precipitated solid substance in suspension or after
          settling or filtering
      v 1: separate as a fine suspension of solid particles
      2: bring about abruptly; "The crisis precipitated by Russia's
         revolution"
      3: fall from clouds; "rain, snow and sleet were falling";
         "Vesuvius precipitated its fiery, destructive rage on
         Herculaneum" [syn: come down, fall]
      4: fall vertically, sharply, or headlong; "Our economy
         precipitated into complete ruin"
      5: hurl or throw violently; "The bridge broke and precipitated
         the train into the river below"