gearbox

[geer-boks]
noun
1.
a transmission, as in an automobile.
2.
a shield or housing for gears.
Also, gear box.


Origin:
1885–90; gear + box1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
gearbox (ˈɡɪəˌbɒks)
 
n
1.  the metal casing within which a train of gears is sealed
2.  this metal casing and its contents, esp in a motor vehicle

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
They have more oomph, and no need of a gearbox to deliver it.
Unlike a conventional turbofan, it uses a gearbox rather than a shaft between
  the fan and the turbine.
Build in a special gearbox which combines the output of the motor with that of
  an internal-combustion engine.
For, once the engine block and the gearbox are gone, the game of car design
  changes.
Image for gearbox
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