fifth wheel

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fifth wheel

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

1. (Mechanical Engineering) a spare wheel for a four-wheeled vehicle
2. (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

fifth′ wheel′

1. 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.
2. a superfluous or unwanted person or thing.

Fifth wheel

Before the advent of trucks, the fifth wheel was a semicircular iron ring attached to a wagon’s front axle to give additional support to the rest of the Running gear as the axle pivoted during turns.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.Fifth wheel - someone or something that is unwanted and unneededfifth 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
References in periodicals archive ?
Shipshewana, Indiana-based K-Z established in 1972 is known for its new, high-quality travel trailers, fifth wheels and toy haulers.
Motorhomes, travel trailers, fifth wheels, tent trailers, slide-in truck campers, folding tents, conversions and accessories will be shown at the show.
Fifth wheels at each end are connected by a structural tube tie rod that allows the trailer to maneuver in tighter spaces and negotiate turns a fifth wheel steer trailer could not manage.
com is an online classified site offering new and used RVs, including motor homes, trailers, fifth wheels, camper vans and truck campers.
The new site features the full line of Pilgrim International travel trailers and fifth wheels with "model overviews" and printable PDF brochures for Pilgrim 1500 Series, Pilgrim 2500 Series, Open Road, Legends MP, Legends HP, Cirrus Ultra Lite and Cirrus Hybrid product lines.
Pilgrim International, America's fastest growing manufacturer and innovator of fifth wheels, travel trailers and hybrid camping trailers, is pleased to announce a unique new agreement with Thousand Trails premium camping resorts.
com) was founded in 1967 and has since become one of the world's top manufacturers of luxury fifth wheels and the number one choice of America's full-time RVers.
com-RV Expo is free to the public and will cover three city blocks where attendees can view and purchase more than 40 new RVs featuring motorhomes from Fleetwood as well as trailers and fifth wheels from Keystone and Dutchman including the "new" FreedomSpirit line.
The product works extremely well on chassis and wheel bearing applications, king pins, transmission cross shaft spring pins, shackle pins, brake cam shafts, u-joints and fifth wheels.