tubes, considered as a group / a length of tube, or a system of tubes / the recreation of riding down a river on an inner tube

present participle of tube

plural of tubing

Enough to fill a tube.

plural of tubeful

Anything that is hollow and cylindrical in shape. / An approximately cylindrical container, usually with a crimped end and a screw top, used to contain and dispense semiliquid substances.

(transitive) To supply with, or enclose in, a tube. / To ride an inner tube. / (medicine, transitive, colloquial) To intubate.

plural of tube / (Internet slang) The Internet. / (slang) The inner workings of one's body.

Third-person singular simple present indicative form of tube

(informal) The London Underground