noun

• 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.
• The trade or occupation of a plumber.
• (informal) A system of vessels or ducts in the human body, especially the genitourinary system.
• (informal, figurative) Practical, concrete work serving to support other work.
• (countable) A Murasugi sum where each disk summed along has its boundary subdivided into four segments.