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

Plumber \Plumb"er\, n. [F. plombier. See {Plumb}.]
One who works in lead; esp., one who furnishes, fits, and
repairs lead pipes.
[1913 Webster]

2. Hence: Any worker who installs or repairs piping and
related equipment for conveyance of water, gas, or
drainage into or out of buildings, or within buildings to
fixtures or equipment using water. The type of material
used for the conduits varies with the application, and may
be may be of lead, iron, copper, glass, palstic, or other
material.
[PJC]