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Noun: gearhead  'geer,hed
Usage: informal
  1. A car enthusiast
    "As a true gearhead, he spent weekends tinkering with his vintage sports car";
    - petrolhead [Brit], revhead [Austral, informal]
     
  2. An engine, mechanical device or gadget enthusiast
    "The gearhead spent hours assembling his new custom-built computer"

Derived forms: gearheads

Encyclopedia: Gearhead