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Tube | Define Tube at Dictionary.comhttps://www.dictionary.com/browse/tubeTube definition, a hollow, usually cylindrical body of metal, glass, rubber, or other material, used especially for conveying or containing liquids or gases. See more.

Tube definition, a hollow, usually cylindrical body of metal, glass, rubber, or other material, used especially for conveying or containing liquids or gases. See more.
www.dictionary.com/browse/tube

Tube | Definition of Tube by Merriam-Websterhttps://www.merriam-webster.com/dictionary/tubed: the basically cylindrical section between the mouthpiece and bell that is the fundamental part of a wind instrument

d: the basically cylindrical section between the mouthpiece and bell that is the fundamental part of a wind instrument
www.merriam-webster.com/dictionary/tube