tube

/tju:b/

Friendly

Explanation of the Word "Tube"

Part of Speech: Noun, Verb

Academic

Noun

1. 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'
2. (anatomy) any hollow cylindrical body structure
3. a hollow cylindrical shape
4. electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
5. conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases

Verb

1. place or enclose in a tube
2. ride or float on an inflated tube
   • We tubed down the river on a hot summer day
3. convey in a tube
   • inside Paris, they used to tube mail
4. provide with a tube or insert a tube into

Synonyms

• metro
• underground
• subway system
• subway
• tube-shaped structure
• pipe
• vacuum tube
• thermionic vacuum tube
• thermionic tube
• electron tube
• thermionic valve
• tubing