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English definition of “tube”

tube

noun (PIPE)    /tjuːb/ US  /tuːb/
B2 [C] a long cylinder made from plastic, metal, rubber, or glass, especially used for moving or containing liquids or gases: Gases produced in the reaction pass through this tube and can then be collected.Plumbing and pipes and sewage [C] in biology, any hollow, cylinder-shaped structure in the body that carries air or liquid: the bronchial tubesSubstances and structures in the body
(Definition of tube noun (PIPE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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