WordReference Random House Unabridged Dictionary of American English © 2025
in′ner tube′, 
  1. a doughnut-shaped, flexible rubber tube inflated inside a tire to bear the weight of a vehicle. Also called tube. 
  • 1890–95

Collins Concise English Dictionary © HarperCollins Publishers::
inner tube
  1. an inflatable rubber tube that fits inside a pneumatic tyre casing
'inner tube' also found in these entries (note: many are not synonyms or translations):
tube - tubeless tire - tubeless tyre - tubing - tyre

Forum discussions with the word(s) "inner tube" in the title:


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