browse words by letter
a b c d e f g h i j k l m n o p q r s t u v w x y z
catalyse


catalyse


  1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Catalysis  \Ca*tal"y*sis\,  n.;  pl  {Catalyse}.[ML.,  fr  Gr  ? 
  dissolution,  fr  ?  to  destroy,  dissolve;  kata`  down  wholly  + 
  ?  to  loose.] 
  1.  Dissolution;  degeneration;  decay.  [R.] 
 
  Sad  catalysis  and  declension  of  piety.  --Evelyn. 
 
  2.  (Chem.) 
  a  A  process  by  which  reaction  occurs  in  the  presence  of 
  certain  agents  which  were  formerly  believed  to  exert 
  an  influence  by  mere  contact  It  is  now  believed  that 
  such  reactions  are  attended  with  the  formation  of  an 
  intermediate  compound  or  compounds,  so  that  by 
  alternate  composition  and  decomposition  the  agent  is 
  apparenty  left  unchanged;  as  the  catalysis  of  making 
  ether  from  alcohol  by  means  of  sulphuric  acid;  or 
  catalysis  in  the  action  of  soluble  ferments  (as 
  diastase,  or  ptyalin)  on  starch. 
  b  The  catalytic  force.