Pronunciation: (tOO'bing, tyOO'-), [key]
1. material in the form of a tube: glass tubing.
2. tubes collectively.
3. a piece of tube: two feet of copper tubing.
4. Also called inner-tubing. the sport or recreation of floating down a river or stream on an inner tube.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.