Flywheel
/ˈflaɪwiːl/
Definition 1 of 2
Pro Tip 1/3Steady Motion
Flywheels help achieve a uniform speed in machines, reducing jerkiness in their operation. 
To prevent any hiccups in production, the factory machines are fitted with flywheels.
Pro Tip 2/3Industrial Use
The term 'flywheel' is often associated with large industrial or antique machinery rather than modern domestic devices. 
Touring the old mill, we saw the massive flywheel connected to the waterwheel.
Pro Tip 3/3Historical Significance
Flywheels were crucial in early industrial machines, such as steam engines, and can indicate historical technology in your conversations. 
Museum exhibits often feature the flywheel to demonstrate the workings of early mechanical engines.