sealed tube means ?? please explain
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hollow, usually cylindrical body of metal, glass, rubber, or other material, used especially for conveying or containing liquids or gases.
a small, collapsible, cylinder of metal or plastic sealed at one end and having a capped opening at the other from which paint, toothpaste, or some other semifluid substance may be squeezed.
Anatomy, Zoology. any hollow, cylindrical vessel or organ:
the bronchial tubes.
Botany.
any hollow, elongated body or part.
the united lower portion of a gamopetalous corolla or a gamosepalous calyx.
verb (used with object), tubed, tub·ing.
to furnish with a tube or tubes.
to convey or enclose in a tube.
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