tres·tle

[tres-uhl]
noun
1.
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.
2.
Civil Engineering.
a.
one of a number of bents, having sloping sides of framework or piling, for supporting the deck or stringers of a bridge.
b.
a bridge made of these.

Origin:
1300–50; Middle English trestel < Middle French, by dissimilation from Old French trestreLatin trānstrum crossbeam

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
trestle (ˈtrɛsəl) [Click for IPA pronunciation guide]
 
n
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
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00:10
Trestle is always a great word to know.
So is quincunx. Does it mean:
a gadget; dingus; thingumbob.
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

trestle
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
At the site, there was a wooden trestle with a large crawler crane situated in the middle of the trestle.
They all sit down for a big feed at trestle tables set outdoors.
They are currently using divers to install under water bracing elements needed to support the heavy trestle loads.
It is often a long, brisk, outdoor walk to a trestle stairway to board the plane.
Images for trestle
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