fifth-wheel trailer

Use Fifth-wheel trailer in a sentence Unabridged

fifth wheel

a horizontal ring or segment of a ring, consisting of two bands that slide on each other, placed above the front axle of a carriage and designed to support the forepart of the body while allowing it to turn freely in a horizontal plane.
a similar device used as a coupling to connect a semitrailer to a tractor.
a similar coupling between a heavy-duty pickup truck and a camping trailer (fifth-wheel trailer) that extends over the bed of the truck.
an extra wheel for a four-wheeled vehicle.
a superfluous, unneeded, or unwanted person or thing: They enjoy making any outsider feel like a fifth wheel.

1870–75 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fifth wheel
1.  a spare wheel for a four-wheeled vehicle
2.  a.  the coupling table of an articulated vehicle
 b.  a steering bearing that enables the front axle of a horse-drawn vehicle to rotate relative to the body
3.  a superfluous or unnecessary person or thing

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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American Heritage
Cultural Dictionary

fifth wheel definition

A hanger-on; a person who serves no function: “The vice president felt like a fifth wheel after his exclusion from the committee.”

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The feeder, crusher, and a discharge conveyor were mounted as a unit on a fifth-wheel trailer.
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