Definition from Wiktionary, the free dictionary
plumbing (plural plumbings)
- (uncountable) 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.
- (uncountable) The trade or occupation of a plumber.
- (uncountable, informal) A system of vessels or ducts in the human body, especially the genitourinary system.
- My plumbing was playing up, so I had to see the doctor.
- (countable) A Murasugi sum where each disk summed along has its boundary subdivided into four segments.
- (genitourinary system): waterworks (informal)
Related terms 
pipes, etc, of a water/gas/sewage system in a building
trade or occupation of a plumber
informal: system of vessels or ducts in the human body, especially the genitourinary system
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