Real Dictionary

flywheel
countable noun: A flywheel is a heavy wheel that is part of some engines. It regulates the engine's rotation, making it operate at a steady speed.

flywheel in American English
a heavy wheel for regulating the speed and uniformity of motion of the machine to which it is attached
noun: a heavy disk or wheel rotating on a shaft so that its momentum gives almost uniform rotational speed to the shaft and to all connected machinery

flywheel in Automotive Engineering
noun: A flywheel is a heavy wheel that is part of some engines. It regulates the engine's rotation, making it operate at a steady speed.

flywheel in British English
noun: a heavy wheel that stores kinetic energy and smooths the operation of a reciprocating engine by maintaining a constant speed of rotation over the whole cycle

flywheel in Mechanical Engineering
noun: A flywheel is a heavy wheel that makes an engine move smoothly by storing kinetic energy and keeping the engine at a constant speed throughout its cycle.