WordReference Random House Unabridged Dictionary of American English © 2025
recip′rocating en′gine, 
  1. Mechanical Engineeringany engine employing the rectilinear motion of one or more pistons in cylinders. Also called displacement engine, piston engine. 
  • 1815–25

Collins Concise English Dictionary © HarperCollins Publishers::
reciprocating engine
  1. an engine in which one or more pistons move backwards and forwards inside a cylinder or cylinders
'reciprocating engine' also found in these entries (note: many are not synonyms or translations):
crosshead - cylinder head - dead center - dead centre - displacement engine - double-acting - equilibrium valve - flywheel - indicated horsepower - jacking engine - opposed-piston engine - piston engine - preadmission - rebore - single-acting - upstroke - valve gear

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