·p.pr. & ·vb.n. of Plumb.
II. Plumbing ·noun The lead or iron pipes, and other apparatus, used in conveying water, sewage, ·etc., in a building.
III. Plumbing ·noun 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.