Etymology
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tubing (n.)

recreational pastime of riding a river on a truck tire inner tube, 1975; see tube (n.).

updated on February 20, 2014

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Definitions of tubing from WordNet

tubing (n.)
conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases;
Synonyms: tube
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.