inner tube
noun
a doughnut-shaped, flexible rubber tube inflated inside a tire to bear the weight of a vehicle.
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Origin of inner tube
First recorded in 1890–95
Also called tube.
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
inner tube
noun
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