Definition of "gearbox" []

• See transmission. (noun)
• A protective casing for a system of gears. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Rust coming out of every panel, some of the blue lights have fallen off and are dangling on the grille, someone has stolen the CCTV camera from in it, the gearbox is a complete mess … I could go on."
• "As explained by several GM engineers and representatives, the gearbox is to improve efficiency at high speeds."
• "It pops and burbles on the overrun and, mated to the seven speed dual clutch gearbox, is fast to rev and shift."