Meaning of 'tube'

noun

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

Example: "in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'"

Synonyms: underground

noun

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

Synonyms: tubing

noun

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

Synonyms: thermionic vacuum tube thermionic tube electron tube thermionic valve

noun

(anatomy) any hollow cylindrical body structure

noun

a hollow cylindrical shape

Synonyms: pipe

verb

place or enclose in a tube

verb

ride or float on an inflated tube

Example: "We tubed down the river on a hot summer day"

verb

convey in a tube

Example: "inside Paris, they used to tube mail"

verb

provide with a tube or insert a tube into