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
His photographs of railroad sheds, tunnels, and trestles convey an industrial
The paved and gravel path winds through wooded areas and crosses multiple
  railroad trestles.
The train is a sort of mechanical mountain goat, balancing on trestles and
  steep rock walls far above deep gorges.
It was not so easy to keep it out on the fills as on the trestles.
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