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fifth wheel |
Also found in: Wikipedia | 0.05 sec. |
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fifth wheel [¦fifth ¦wēl] (mechanical engineering) A coupling device in the form of two horizontal disks that rotate on each other positioned between a tractor and a semitrailer so that they can change direction independently. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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