GNU Collaborative International Dictionary of English

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Found one definition

1.       
   flywheel n. A heavy wheel or disk which stores kinetic energy by rotating on a shaft, and by its momentum smoothes the operation of a reciprocating engine by reducing fluctuations of speed.  It is used in certain types of machinery, such as automobiles.
   
   [WordNet 1.5 +PJC]
   
   ☞ Flywheels rotating at high speed have also been proposed as a means to store kinetic energy for use as a low-polluting source of energy in vehicles.
   
   [PJC]