2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Retarder  \Re*tard"er\,  n. 
  One  who  or  that  which  retards. 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Retarder  \Re*tard"er\  (r[-e]*t[aum]r"d[~e]r),  n. 
  1.  (Steam  Boiler)  Any  of  various  devices,  as  a  helix  of  flat 
  metal  strip,  introduced  into  a  boiler  tube  to  increase  the 
  heating  effect  of  the  fire. 
 
  2.  (Photog.)  A  substance,  as  potassium  bromide,  added  to  a 
  developer  to  retard  its  action 

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