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fifth wheel
(redirected from fifth wheels)

   Also found in: Idioms, Encyclopedia 0.01 sec.
fifth wheel
n.
1.
a. A wheel or portion of a wheel placed horizontally over the forward axle of a carriage to provide support and stability during turns.
b. A similar device over the rear axle or axles of a tractor or pickup truck, serving as a coupling for a semitrailer.
2. An additional wheel carried on a four-wheeled vehicle as a spare.
3. An extra and unnecessary person or thing.

fifth wheel
n
1. (Engineering / Mechanical Engineering) a spare wheel for a four-wheeled vehicle
2. (Engineering / Mechanical Engineering)
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
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.fifth wheelfifth wheel - someone or something that is unwanted and unneeded
redundance, redundancy - the attribute of being superfluous and unneeded; "the use of industrial robots created redundancy among workers"
2.fifth wheel - an extra car wheel and tire for a four-wheel vehicle
car wheel - a wheel that has a tire and rim and hubcap; used to propel the car
3.fifth wheel - a steering bearing that enables the front axle of a horse-drawn wagon to rotate
bearing - a rotating support placed between moving parts to allow them to move easily


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? Mentioned in ? References in periodicals archive
 
Many of the structures actually incorporate their owners' trailers and fifth wheels, connecting them to permanent water, sewage, and electricity.
The dual-purpose system converts from fifth wheel to gooseneck configuration in minutes; handles fifth wheels up to 20,000 lb.
Motorhomes, travel trailers, fifth wheels, tent trailers, slide-in truck campers, folding tents, conversions and accessories will be shown at the show.
 
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