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A large transport truck that consists of a tractor unit in the front onto which one or more wheeled freight trailers can be hitched. These trucks are called semi-trailer because the cargo units only have wheels in the back, and their front part must be attached to the towing tractor.
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"Freightliner Classic Semi-Trailer, June 6, 2010" by Frank Deanrdo is licensed under CC BY.
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The Free Dictionary Online
2015 Semitrailer. http://www.thefreedictionary.com/semitrailer. Accessed April 3, 2015.