Definition of gearhead noun from the Oxford Advanced American Dictionary

 

gearhead

 noun
noun
NAmE//ˈɡɪrhɛd//
 
(informal)
 
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a person who is very enthusiastic about cars or new technical devices and equipment He's a total gearhead—can't keep away from the racetrack. Like most avid cyclists I'm a gearhead.
See the Oxford Advanced Learner's Dictionary entry: gearhead