Inside the Universes

[tube.n.01] as in: conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases

[tube.n.02] as in: electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope

[pipe.n.03] as in: a hollow cylindrical shape

[tube.n.04] as in: (anatomy) any hollow cylindrical body structure

[metro.n.01] as in: an electric railway operating below the surface of the ground (usually in a city)

[tube.v.01] as in: provide with a tube or insert a tube into

[tube.v.02] as in: convey in a tube

[tube.v.03] as in: ride or float on an inflated tube

[tube.v.04] as in: place or enclose in a tube

					tube (English)
└── tube (Middle French (ca. 1400-1600))
    └── tubus (Latin)