tube
Definitions
A long, hollow cylinder of metal, plastic, glass, or other material, used especially for conveying liquids or gases.
A flexible cylindrical container sealed at one end and squeezed to eject its contents, such as toothpaste.
An underground railway system, especially the one in London.
Examples
I squeezed the last bit of toothpaste out of the tube.
We took the underground tube to get across London quickly.