sem·i·trail·er

[sem-i-trey-ler]
noun
1.
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.

Origin:
1915–20; semi- + trailer

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
semitrailer (ˌsɛmɪˈtreɪlə) [Click for IPA pronunciation guide]
 
n
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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00:10
Semitrailer is always a great word to know.
So is quincunx. Does it mean:
a scrap or morsel of food left at a meal.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Etymonline
Word Origin & History

semitrailer
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
The kingpin, a part of the fifth wheel connection, is the pivot point between the tractor and semitrailer.
Permanent registration of trailer and semitrailer fleets.
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