inner tube innersole • innervate · · · Info · Definitions · Characters · · inner tube · · Text Common · · Latin · · Scripts 10 · · Length 3 · · Syllables Definitions · · · (noun) an inflatable rubber tube that fits inside the casing of a pneumatic tire. Synonyms: inner tube. · · Noun Definition 1 Characters · · space U+0020 b latin small letter b U+0062 e latin small letter e U+0065 i latin small letter i U+0069 n latin small letter n U+006E r latin small letter r U+0072 t latin small letter t U+0074 u latin small letter u U+0075