inner tube

Noun
  1. An inflatable rubber tube that fits inside the casing of a pneumatic tire (synset 103578156)
    is a type of: tube, tubing - conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases
    is a part of: pneumatic tire, pneumatic tyre - a tire made of reinforced rubber and filled with compressed air; used on motor vehicles and bicycles etc

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