Definition of "plumbing"

The pipes, together with the joints, tanks, stopcocks, taps, and other fixtures of a water, gas, or sewage system in a house or other building.  examples

The trade or occupation of a plumber.  examples

(informal) A system of vessels or ducts in the human body, especially the genitourinary system.  quotations  examples

(informal, figurative) Practical, concrete work serving to support other work.  examples

(countable) A Murasugi sum where each disk summed along has its boundary subdivided into four segments.  examples