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engine 
  n 
1 any machine designed to convert energy, esp. thermal energy, into mechanical work 
a steam engine, a petrol engine  
2 
a a railway locomotive 
b (as modifier) 
the engine cab  
3  (Military) any of various pieces of equipment formerly used in warfare, such as a battering ram or gun 
4 Obsolete any instrument or device 
engines of torture  
  (C13: from Old French engin, from Latin ingenium nature, talent, ingenious contrivance, from in-2 + -genium, related to gignere to beget, produce) 

aero engine 
  n an engine for powering an aircraft 
air engine 
  n 
1 an engine that uses the expansion of heated air to drive a piston 
2 a small engine that uses compressed air to drive a piston 
beam engine 
  n an early type of steam engine, in which a pivoted beam is vibrated by a vertical steam cylinder at one end, so that it transmits motion to the workload, such as a pump, at the other end 
bypass engine 
  n a gas turbine in which a part of the compressor delivery bypasses the combustion zone, flowing directly into or around the main exhaust gas flow to provide additional thrust 
 Compare  →  turbofan 
compound engine 
  n 
1 a steam engine in which the steam is expanded in more than one stage, first in a high-pressure cylinder and then in one or more low-pressure cylinders 
2 a reciprocating engine in which the exhaust gases are expanded in a turbine to drive a supercharger 
compression-ignition engine 
  n a type of internal-combustion engine, such as a diesel, in which ignition occurs as a result of the rise in temperature caused by compression of the mixture in the cylinder 
diesel engine , motor 
  n a type of internal-combustion engine in which atomized fuel oil is sprayed into the cylinder and ignited by compression alone 
donkey engine 
  n a small auxiliary engine, such as one used for pumping water into the boilers of a steamship 
engine driver 
  n  (Chiefly Brit) a man who drives a railway locomotive; train driver 
engine pod 
  n  (Aeronautics) an aircraft turbojet unit comprising the engine and its cowling suspended by a pylon, often below the wing 
engine room 
  n a place where engines are housed, esp. on a ship 
external-combustion engine 
  n a heat engine in which the working fluid is heated in an external boiler or heat exchanger and is thus isolated from the process of fuel combustion 
fire engine 
  n a heavy road vehicle that carries firemen and fire-fighting equipment to a fire 
gas engine 
  n a type of internal-combustion engine using a flammable gas, such as coal gas or natural gas, as fuel 
heat engine 
  n an engine that converts heat energy into mechanical energy 
internal-combustion engine 
  n a heat engine in which heat is supplied by burning the fuel in the working fluid (usually air) 
ion engine 
  n a type of rocket engine in which thrust is obtained by the electrostatic acceleration of charged positive ions 
 Compare  →  plasma engine 
jet engine 
  n a gas turbine, esp. one fitted to an aircraft 
light engine 
  n a railway locomotive in motion without drawing any carriages or wagons, (U.S. equivalent)  wildcat 
overhead-valve engine 
  n a type of internal-combustion engine in which the inlet and exhaust valves are in the cylinder head above the pistons, (U.S. name)  valve-in-head engine  Compare  →  side-valve engine 
petrol engine 
  n an internal-combustion engine that uses petrol as fuel 
pilot engine 
  n a locomotive that leads one or more other locomotives at the head of a train of coaches or wagons 
plasma engine 
  n an engine that generates thrust by reaction to the emission of a jet of plasma 



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