Definify.com
Webster 1913 Edition
Plumbing
Plumb′ing
,Noun.
1.
The art of casting and working in lead, and applying it to building purposes; especially, the business of furnishing, fitting, and repairing pipes for conducting water, sewage, etc.
Gwilt.
2.
The lead or iron pipes, and other apparatus, used in conveying water, sewage, etc., in a building.