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  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Precipitate  \Pre*cip"i*tate\,  n.  [NL.  praecipitatum:  cf  F. 
  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 
  {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 
  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}.