a frame typically composed of a horizontal bar or beam rigidly joined or fitted at each end to the top of a transverse A-frame, used as a barrier, a transverse support for planking, etc.; horse.
Civil Engineering.
one of a number of bents, having sloping sides of framework or piling, for supporting the deck or stringers of a bridge.
a bridge made of these.

1300–50; Middle English trestel < Middle French, by dissimilation from Old French trestreLatin trānstrum crossbeam Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trestle (ˈtrɛsəl)
1.  a framework in the form of a horizontal member supported at each end by a pair of splayed legs, used to carry scaffold boards, a table top, etc
2.  a.  a braced structural tower-like framework of timber, metal, or reinforced concrete that is used to support a bridge or ropeway
 b.  a bridge constructed of such frameworks
[C14: from Old French trestel, ultimately from Latin trānstrumtransom]

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

early 14c., "a support for something," from O.Fr. trestel "crossbeam" (12c.), presumed to be an alteration of L. *transtellum, dim. of transtrum "beam, crossbar." Specific meaning "support for a bridge" is recorded from 1796.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The trestle legs fold, and both pieces can be stowed in the back of a closet.
Its members set up trestle tables at weekends in several big cities and hand
  out leaflets.
It occurred where eastbound and westbound rails overlap on a trestle.
In between were three rows of trestle tables with benches.
Images for trestle
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