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gearbox

or gear box

[geer-boks]
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noun
  1. a transmission, as in an automobile.
  2. a shield or housing for gears.
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Origin of gearbox

First recorded in 1885–90; gear + box1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for gearbox

gearbox

noun
  1. the metal casing within which a train of gears is sealed
  2. this metal casing and its contents, esp in a motor vehicle
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012