from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A wheel or portion of a wheel placed horizontally over the forward axle of a carriage to provide support and stability during turns.
  • n. A similar device over the rear axle or axles of a tractor or pickup truck, serving as a coupling for a semitrailer.
  • n. An additional wheel carried on a four-wheeled vehicle as a spare.
  • n. An extra and unnecessary person or thing.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. 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.
  • n. A very large truck trailer; an 18-wheeler.
  • n. A very large trailer that is towed with a pickup truck.
  • n. Anything superfluous or unnecessary.

from the GNU version of the Collaborative International Dictionary of English

  • adj. a horizontal wheel or segment above the fore axle of a carriage and beneath the body, forming an extended support to prevent careening.
  • n.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a steering bearing that enables the front axle of a horse-drawn wagon to rotate
  • n. someone or something that is unwanted and unneeded
  • n. an extra car wheel and tire for a four-wheel vehicle


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