tube n
1. conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases [syn: tubing]
2. electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope [syn: vacuum tube, thermionic vacuum tube, thermionic tube, electron tube, thermionic valve]
3. a hollow cylindrical shape [syn: pipe]
4. (anatomy) any hollow cylindrical body structure [syn: tube-shaped structure}]
5. electric underground railway [syn: metro, subway, underground] v
6. provide with a tube or insert a tube into
7. convey in a tube; "inside Paris, they used to tube mail"
8. ride or float on an inflated tube; "We tubed down the river on a hot summer day"
9. place or enclose in a tube

Visceral \Vis"cer*al\, a. [Cf. F. visc['e]ral, LL. visceralis.]
1. (Anat.) Of or pertaining to the viscera; splanchnic.
2. Fig.: Having deep sensibility. [R.] --Bp. Reynolds. Visceral arches (Anat.), the bars or ridges between the visceral clefts. Visceral cavity or tube (Anat.), the ventral cavity of a vertebrate, which contains the alimentary canal, as distinguished from the dorsal, or cerebro-spinal, canal. Visceral clefts (Anat.), transverse clefts on the sides just back of the mouth in the vertebrate embryo, which open into the pharyngeal portion of the alimentary canal, and correspond to the branchial clefts in adult fishes.

Tube \Tube\, n. (Elec. Railways) A tunnel for a tube railway; also (Colloq.), a tube railway. [Chiefly Eng.]

Tube \Tube\, n. [L. tubus; akin to tuba a trumpet: cf F. tube.]
1. A hollow cylinder, of any material, used for the conveyance of fluids, and for various other purposes; a pipe.
2. A telescope. ``Glazed optic tube.'' --Milton.
3. A vessel in animal bodies or plants, which conveys a fluid or other substance.
4. (Bot.) The narrow, hollow part of a gamopetalous corolla.
5. (Gun.) A priming tube, or friction primer. See under Priming, and Friction.

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• Sharon Tube Marks Official Launch With Ribbon-Cutting Event
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• Letters: The tube is a great public institution
  It was good to read Ian Jack's description of the London Underground as a "great public institution" (What's Ian seen, 18 May). In all the publicity surrounding the 150th anniversary of the tube , hardly a word has been said about another important date: the 80th anniversary of public ownership, inaugurated on 1 July 1933, when the underground be Read more on this news related to 'Tube'