Buis
Buis is a Dutch noun meaning a hollow cylindrical object used to convey liquids, gases, or electrical signals, and more generally a pipe or tube. It is encountered across many domains, from everyday plumbing to industrial conduits and electronic components. In plumbing and construction, compounds such as waterbuis (water pipe), afvoerbuis (drain pipe), and kabelbuis (cable conduit) illustrate the term's versatility. In electronics and old radio or television technology, "buis" refers to vacuum tubes, as in elektronenbuis or vacuümbuis, used to amplify signals before solid-state devices became dominant. In medicine or biology, the word may describe a tubular structure or duct, with more precise terms used for specific organs.
Buis is also a surname in Dutch-speaking areas. As a common noun, it forms the plural buizen.