tube

Pronunciation

• (UK) IPA ^(key): /tjuːb/
• (US) IPA ^(key): /tuːb/

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Noun

Singular tube

Plural tubes

A tube

1. (countable) A tube is a long object with a hole from one end to the other. The ends may be closed or open.

   The high pressure forces the water through the tube.

   Toothpaste comes in a tube.

2. (uncountable) The Tube is the underground train system in London, England.
   • Synonyms: subway and metro

Related words

• cathode ray tube
• test tube
• vacuum tube
• fluorescent tube
• inner tube
• tubular

Verb

Plain form tube

Third-person singular tubes

Past tense tubed

Past participle tubed

Present participle tubing

1. (intransitive) If you tube, you float on an inner tube.

   We went white-water tubing on the Yukon River.