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The Collaborative International Dictionary of English v.0.48 (gcide)

Plumbing \Plumb"ing\, n.
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.
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2. The lead or iron pipes, and other apparatus, used in
conveying water, sewage, etc., in a building.
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Plumb \Plumb\, v. t. [imp. & p. p. {Plumbed} (pl[u^]md); p. pr.
& vb. n. {Plumbing} (pl[u^]m"[i^]ng).]
1. To adjust by a plumb line; to cause to be perpendicular;
as, to plumb a building or a wall.
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2. To sound with a plumb or plummet, as the depth of water;
hence, to examine by test; to ascertain the depth,
quality, dimension, etc.; to sound; to fathom; to test.
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He did not attempt to plumb his intellect. --Ld.
Lytton.
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3. To seal with lead; as, to plumb a drainpipe.
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4. To supply, as a building, with a system of plumbing.
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