a doughnut-shaped, flexible rubber tube inflated inside a tire to bear the weight of a vehicle.
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You may have read the word "simmer" in a recipe or two, but what does it really mean?
Also called tube.
Origin of inner tube
First recorded in 1890–95
Words nearby inner tube
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
British Dictionary definitions for inner tube
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