1. Conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases (synset 104500800)
  2. Electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope (synset 104501499)
  3. A hollow cylindrical shape (synset 113924014)
  4. (anatomy) any hollow cylindrical body structure (synset 105253854)
  5. An electric railway operating below the surface of the ground (usually in a city) (synset 103762667)
    "in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'"
  1. Provide with a tube or insert a tube into (synset 202334288)
  2. Convey in a tube (synset 202083772)
    "inside Paris, they used to tube mail"
  3. Ride or float on an inflated tube (synset 201844871)
    "We tubed down the river on a hot summer day"
  4. Place or enclose in a tube (synset 201583777)

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