A wheel with teeth around its edge that meshes with other toothed wheels to transmit motion and power in machinery.
Compound of 'gear' and 'wheel.' The term has been used since at least the Middle Ages to describe toothed wheels in mechanical devices.
Gearwheels are humanity's oldest mechanical multipliers—with just the right angle and tooth count, one small gearwheel can control the force of something 100 times heavier.
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