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plumbing (n.)

mid-15c., "the weighting of a fishing line," verbal noun from plumb (v.). Specific meaning "water and drainage pipes" is recorded by 1875, American English.

THE apparatus by which the water from a reservoir is carried about over a building and delivered at points convenient for use, is called by the general name of plumbing. The word "plumbing" means lead-work; and it is used to signify this water apparatus of a house because the pipes of which it largely consists are usually made of lead. [Edward Abbott, "Long Look House: A Book for Boys and Girls," Boston, 1877]

Alternative plumbery also is mid-15c. Slang meaning "a person's reproductive organs" attested by 1975.

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Definitions of plumbing from WordNet

plumbing (n.)
utility consisting of the pipes and fixtures for the distribution of water or gas in a building and for the disposal of sewage;
Synonyms: plumbing system
plumbing (n.)
the occupation of a plumber (installing and repairing pipes and fixtures for water or gas or sewage in a building);
Synonyms: plumbery
plumbing (n.)
measuring the depths of the oceans;
Synonyms: bathymetry
From wordnet.princeton.edu