inner tube

1. 1.

   an inflatable rubber tube that fits inside the casing of a pneumatic tire

   Broadertube

   Part ofpneumatic tire

Questions about inner tube

What does inner tube mean?

inner tube means "an inflatable rubber tube that fits inside the casing of a pneumatic tire".

Is inner tube a common word?

inner tube is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.