gearhead
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gear·head
(gîr′hĕd′)n. Slang
One who is knowledgeable or enthusiastic about the equipment and functioning of mechanical devices, especially automobiles.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
gearhead
(ˈɡɪəˌhɛd)n
1. (Mechanical Engineering) a mechanical device which increases the torque of a gear mechanism
2. informal a technology enthusiast
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014