| blowtube | (noun) a tube that directs air or gas into a flame to concentrate heat | Synonyms: blow tube, blowpipe |
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| (noun) a tube through which darts can be shot by blowing | Synonyms: blow tube, blowgun, blowpipe |
| nanotube | (noun) a fullerene molecule having a cylindrical or toroidal shape | Synonyms: carbon nanotube |
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| tube | (noun) conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases | Synonyms: tubing |
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| (noun) an electric railway operating below the surface of the ground (usually in a city) | Synonyms: metro, subway, subway system, underground |
| (noun) electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope | Synonyms: electron tube, thermionic tube, thermionic vacuum tube, thermionic valve, vacuum tube |
| (noun) (anatomy) any hollow cylindrical body structure | Synonyms: tube-shaped structure |
| (noun) a hollow cylindrical shape | Synonyms: pipe |
| watertube | (noun) a boiler tube through which the water flows. | Synonyms: water tube |
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