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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Injector  \In*ject"or\,  n. 
  1.  One  who  or  that  which  injects. 
  2.  (Mach.)  A  contrivance  for  forcing  feed  water  into  a  steam 
  boiler  by  the  direct  action  of  the  steam  upon  the  water. 
  The  water  is  driven  into  the  boiler  by  the  impulse  of  a 
  jet  of  the  steam  which  becomes  condensed  as  soon  as  it 
  strikes  the  stream  of  cold  water  it  impels;  --  also  called 
  {Giffard's  injector},  from  the  inventor.