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inner tube

noun
1.
a doughnut-shaped, flexible rubber tube inflated inside a tire to bear the weight of a vehicle.
Also called tube.
Origin
1890-1895
1890-95
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for inner-tube

inner tube

noun
1.
an inflatable rubber tube that fits inside a pneumatic tyre casing
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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5
7
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