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Definition of tube:

  1. A hollow cylinder, of any material, used for the conveyance of fluids, and for various other purposes; a pipe.
  2. A more or less cylindrical, and often spiral, case secreted or constructed by many annelids, crustaceans, insects, and other animals, for protection or concealment. See Illust. of Tubeworm.
  3. A priming tube, or friction primer. See under Priming, and Friction.
  4. A small pipe forming part of the boiler, containing water and surrounded by flame or hot gases, or else surrounded by water and forming a flue for the gases to pass through.
  5. A telescope.
  6. A tunnel for a tube railway; also ( Colloq.), a tube railway.
  7. A vessel in animal bodies or plants, which conveys a fluid or other substance.
  8. One of the siphons of a bivalve mollusk.
  9. The narrow, hollow part of a gamopetalous corolla.
  10. To furnish with a tube; as, to tube a well.

Synonyms:

piping, subway system, pipe, hose, conduit, tunnel, pipage, package, cell, thermionic vacuum tube, vacuum tube, device, underpass, thermionic tube, machine, loom, tubing, tobacco pipe, electron tube, subway, thermionic valve, tube-shaped structure, underground, metro, organ pipe, container, pipework.

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