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pistonmore about piston


  2  definitions  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Piston  \Pis"ton\,  n.  [F.  piston;  cf  It  pistone  piston,  also 
  pestone  a  large  pestle;  all  fr  L.  pinsere  pistum,  to  pound, 
  to  stamp.  See  {Pestle},  {Pistil}.]  (Mach.) 
  A  sliding  piece  which  either  is  moved  by  or  moves  against, 
  fluid  pressure.  It  usually  consists  of  a  short  cylinder 
  fitting  within  a  cylindrical  vessel  along  which  it  moves 
  back  and  forth.  It  is  used  in  steam  engines  to  receive  motion 
  from  the  steam,  and  in  pumps  to  transmit  motion  to  a  fluid; 
  also  for  other  purposes. 
  {Piston  head}  (Steam  Eng.),  that  part  of  a  piston  which  is 
  made  fast  to  the  piston  rod. 
  {Piston  rod},  a  rod  by  which  a  piston  is  moved  or  by  which 
  it  communicates  motion. 
  {Piston  valve}  (Steam  Eng.),  a  slide  valve,  consisting  of  a 
  piston,  or  connected  pistons,  working  in  a  cylindrical 
  case  which  is  provided  with  ports  that  are  traversed  by 
  the  valve. 
  From  WordNet  r  1.6  [wn]: 
  n  :  a  part  of  a  machine  that  has  a  plunging  or  thrusting  motion 
  [syn:  {plunger}] 

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