What does the word plumbing mean?

Usage examples for plumbing

  1. Construction in wood, stone, iron and metals; laws of building; modes of heat, light and ventilation; plumbing; interior fittings; these and other occupations are taken up. – The Condition and Tendencies of Technical Education in Germany by Arthur Henry Chamberlain
  2. Where do you get fancy plumbing in this wilderness? – The Danger Mark by Robert W. Chambers
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