1. • noun - conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases
   • noun - electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
   • noun - a hollow cylindrical shape
   • noun - (anatomy) any hollow cylindrical body structure
   • noun - an electric railway operating below the surface of the ground (usually in a city)
   • verb - provide with a tube or insert a tube into
   • verb - convey in a tube
   • verb - ride or float on an inflated tube
   • verb - place or enclose in a tube
2. • A hollow cylinder, especially one that conveys a fluid or functions as a passage.
   • An organic structure having the shape or function of a tube; a duct: a bronchial tube.
   • A small, flexible cylindrical container sealed at one end and having a screw cap at the other, for pigments, toothpaste, or other pastelike substances.
   • The cylindrical part of a wind instrument.
   • Electronics.
   • An electron tube.
   • A vacuum tube.
   • The lower, cylindrical part of a gamopetalous corolla or a gamosepalous calyx.
   • A subway; an underground.
   • A tunnel.
   • An inner tube.
   • Slang.
   • A television set.
   • To provide with a tube; insert a tube in.
   • To float down a stream or river for recreation in an inner tube: went tubing on Sunday afternoon.
3. • v - to provide with a tube (a long, hollow cylinder)

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