· conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases

Synonym(s): tubing

Hypernym(s): conduit

· electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope

Synonym(s): vacuum_tube, thermionic_vacuum_tube, thermionic_tube, electron_tube, thermionic_valve

Hypernym(s): electronic_device

· a hollow cylindrical shape

Synonym(s): pipe

Hypernym(s): cylinder

· (anatomy) any hollow cylindrical body structure

Synonym(s): tube-shaped_structure

Hypernym(s): structure, anatomical_structure, complex_body_part, bodily_structure, body_structure

· an electric railway operating below the surface of the ground (usually in a city); "in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'"

Synonym(s): metro, underground, subway_system, subway

Hypernym(s): railway, railroad, railroad_line, railway_line, railway_system

· provide with a tube or insert a tube into

Hypernym(s): supply, provide, render, furnish

· convey in a tube; "inside Paris, they used to tube mail"

Hypernym(s): bring, convey, take

· ride or float on an inflated tube; "We tubed down the river on a hot summer day"

Hypernym(s): ride

· place or enclose in a tube

Hypernym(s): envelop, enfold, enwrap, wrap, enclose