tube Meaning, Definition & Usage

noun conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases
tubing.
noun electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
vacuum tube; electron tube; thermionic vacuum tube; thermionic valve; thermionic tube.
noun a hollow cylindrical shape
pipe.
noun (anatomy) any hollow cylindrical body structure
tube-shaped structure.
noun an electric railway operating below the surface of the ground (usually in a city)
underground; subway system; subway; metro.
- in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'
verb provide with a tube or insert a tube into
verb convey in a tube
- inside Paris, they used to tube mail
verb ride or float on an inflated tube
- We tubed down the river on a hot summer day
verb place or enclose in a tube

L.tubus; akin to tuba a trumpet: cf F. tube.

A hollow cylinder, of any material, used for the conveyance of fluids, and for various other purposes; a pipe.
A telescope. "Glazed optic tube." Milton.
A vessel in animal bodies or plants, which conveys a fluid or other substance.
(Bot.) The narrow, hollow part of a gamopetalous corolla.
(Gun.) A priming tube, or friction primer. See under Priming, and Friction.
(Steam Boilers) 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.
(Zoöl.) (a) 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. (b) One of the siphons of a bivalve mollusk.

imperfect & past participle Tubed ; present participle & verbal noun Tubing