tub·ing (tbĭng, ty-)
a. Tubes considered as a group.
b. A system of tubes.
c. A piece or length of tube.
2. Tubular fabric, such as that used for making pillowcases.
3. The activity of riding an inner tube or other inflated device for fun or relaxation, as in a stream, down a snow-covered hill, or towed behind a motorboat in a body of water.
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Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.