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gear
A wheel with teeth cut into its edge that meshes with one or more similar wheels to increase the speed or torque of an engine.
The gearbox in a car contains gear wheels of different sizes that mesh together to make the car go faster, increase its climbing power up hills, or drive in reverse.
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Automobile or Related Car Terms
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(what resembles an odd marriage between Trojan battle gear and Medusa is actually part of the most powerful brain scanner ever made)