a large van or wagon drawn by an automobile, truck, or tractor, used especially in hauling freight by road. Compare full trailer, semitrailer.
Also called travel trailer. a vehicle attached to an automobile and used as a mobile home or place of business, usually equipped with furniture, kitchen facilities, bathroom, etc. Compare tent trailer.
a person or thing that trails.
a trailing plant.
a short promotional film composed of clips showing highlights of a movie due for release in the near future.
blank film at the end of a reel or strip of film, for winding off the film in a motion-picture camera or projector. Compare leader ( def 6 ).
Ceramics. a can with a spout, used in slip trailing.

1580–90; trail + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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World English Dictionary
trailer (ˈtreɪlə)
1.  a road vehicle, usually two-wheeled, towed by a motor vehicle: used for transporting boats, etc
2.  the part of an articulated lorry that is drawn by the cab
3.  a series of short extracts from a film, used to advertise it in a cinema or on television
4.  a person or thing that trails
5.  (US), (Canadian) Also called (in Britain and certain other countries): caravan a large enclosed vehicle capable of being pulled by a car or lorry and equipped to be lived in

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

1890, "vehicle pulled by another," from trail (v.); originally a small carriage drawn along by a bicycle. Meaning "preview of a coming movie" first attested 1928. Trailer park first recorded 1947.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
And when the playhouse folded up and drove off, a screen mounted on the side of
  the trailer replayed the show for all to see.
We'd been campers, and our miners' shacks were much-improved versions of tent
  or trailer.
Try telling an over the road tractor trailer driver that.
In fact its initial dimensions were set by road regulations on truck trailer
Images for trailer
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