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conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope (anatomy) any hollow cylindrical body structure place or enclose in a tube ride or float on an inflated tube; "We tubed down the river on a hot summer day" convey in a tube; "inside Paris, they used to tube mail" provide with a tube or insert a tube into a hollow cylindrical shape electric underground railway |
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