inner tube

noun
a doughnut-shaped, flexible rubber tube inflated inside a tire to bear the weight of a vehicle.
Also called tube.


Origin:
1890–95

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To inner tube
Collins
World English Dictionary
inner tube
 
n
an inflatable rubber tube that fits inside a pneumatic tyre casing

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
We'd feel the clams with our feet and rake them up, flipping them into a net
  attached to the inner tube.
Make a manifold with three lines to inner tube valves.
Every time you patch an inner tube, for example, you help limit the production
  and disposal of these nonrenewable resources.
He was relying on a heavy-duty inner tube, a pair of waders and flippers to
  propel him to the spots he wanted to work.
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