| Engelsk substantiv: thermionic tube | 
| 1. | thermionic tube (om gjenstand) electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope | 
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 | Ord med samme betydning (synonymer) | electron tube, thermionic vacuum tube, thermionic valve, tube, vacuum tube | 
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 | Mindre spesifikke uttrykk | electronic device | 
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 | Mere spesifikke uttrykk | acorn tube, diode, electron multiplier, gas-discharge tube, klystron, magnetron, pentode, rectifying tube, rectifying valve, television pickup tube, television-camera tube, tetrode, triode, X-ray tube | 
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 | Omfatter disse spesifikke uttrykk | anode, cathode, control grid, electrode, grid, plate | 
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 | Omfatter disse overordnede uttrykkene | circuit, electric circuit, electrical circuit | 
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