Gearhead definitions

gîr'hĕd'
One who is knowledgeable or enthusiastic about the equipment and functioning of mechanical devices, especially automobiles.
noun
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A gearhead is a high-tech enthusiast who loves electronic devices and gadgets. The term also refers to a "motorhead," a person who is mechanically inclined and loves cars. See high-tech people.
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A mechanical device used to increase the torque of gears.
noun
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(informal) An enthusiast for new technology, or for motoring.
noun
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Origin of gearhead

gear +"Ž -head