1. The pipes, fixtures, and other apparatus of a water, gas, or sewage system in a building.
2. The work or trade of a plumber.
3. Informal An arrangement of bodily vessels or ducts: "treating stroke victims by reversing the plumbing of the body's circulatory system" (Associated Press).
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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.