Synonyms of TUBE

noun

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

   • TUBING9

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

   Also: vacuum tube, thermionic vacuum tube, thermionic tube, electron tube, thermionic valve.

3. a hollow cylindrical shape

   • PIPE8

4. (anatomy) any hollow cylindrical body structure

   Also: tube-shaped structure.

5. an electric railway operating below the surface of the ground (usually in a city)

   • METRO7
   • UNDERGROUND14
   • SUBWAY14

   Also: subway system.