gear-box

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

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