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

  • n. A flexible, airtight hollow ring, usually made of rubber, that is inserted into the casing of a pneumatic tire for holding compressed air.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An inflatable rubber tube inserted into the casing of a pneumatic tyre / tire

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

  • n. an inflatable rubber tube that fits inside the casing of a pneumatic tire


Sorry, no etymologies found.


  • We stayed at the Sport Hotel on the water in Tihany and I spent much of my time paddling around on an inner tube in the lake.

    Enemies of the People


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