Also called semi. a detachable trailer for hauling freight, with wheels at the rear end, the forward end being supported by the rear of a truck tractor when attached. Compare full trailer.

1915–20; semi- + trailer Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
semitrailer (ˌsɛmɪˈtreɪlə)
a type of trailer or articulated lorry that has wheels only at the rear, the front end being supported by the towing vehicle

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1919, from semi- (q.v.) + trailer. Short form semi is attested from 1942.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Permanent registration of trailer and semitrailer fleets.
The kingpin, a part of the fifth wheel connection, is the pivot point between the tractor and semitrailer.
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