stock car

noun
1.
a standard model of automobile changed in various ways for racing purposes.
2.
Also called cattle car. Railroads. a boxcar for carrying livestock.

Origin:
1855–60, Americanism for def 2

stock-car, adjective
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Collins
World English Dictionary
stock car
 
n
1.  a.  a car, usually a production saloon, strengthened and modified for a form of racing in which the cars often collide
 b.  (as modifier): stock-car racing
2.  (US), (Canadian) Also called (in Britain and certain other countries): cattle truck a railway wagon designed for carrying livestock

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

stock car
racing car with a basic chassis of an ordinary commercially produced vehicle, 1914, Amer.Eng., from stock (n.2) + car.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But stock car racing is actually quite complicated and challenging.
Also, a rundown, closed racetrack once used for stock car racing was next to
  the lake.
Moody contributed significantly to stock car racing, especially in the area of
  high performance and safety.
For those who prefer a faster pace, stock car racing takes place at tracks
  around the state.
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