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noun 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. Note: 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.
Collaborative International Dictionary of English 0.48
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