plumber(n = noun.person) pipe fitter - a craftsman who installs and repairs pipes and fixtures and appliances;
is a kind of artificer, artisan, craftsman, journeyman
1. One who works in lead; esp., one who furnishes, fits, and repairs lead pipes. [1913 Webster]
2. 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]
plumber, n. a person who fits and repairs the apparatus of a water-supply, heating, etc.
Etymology:
ME plummer etc. f. OF plommier f. L plumbarius f. plumbum LEAD(2)