Fifth Wheel Definition

noun
A horizontal wheel-like structure placed over the front axle of a carriage or wagon to support it on turns.
Webster's New World
A similar structure on the rear of the cab of a tractor-trailer, serving as a coupling for attaching the trailer.
Webster's New World
An additional wheel carried on a four-wheeled vehicle as a spare.
American Heritage
An unnecessary or superfluous person or thing.
Webster's New World

A type of trailer hitch, which consists of a horseshoe-shaped plate on a multi-directional pivot, with a locking pin to couple with the kingpin of a truck trailer.

Wiktionary
Synonyms:

Other Word Forms of Fifth Wheel

Noun

Singular:
fifth wheel
Plural:
fifth-wheels

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fifth wheel