tube (noun)
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]
tube
(verb)
1: provide with a tube or insert a tube into
2: convey in a tube; "inside Paris, they used to tube mail"
3: ride or float on an inflated tube; "We tubed down the river on a hot summer day"
4: place or enclose in a tube