vacuum tube ( synonym found)
Definition of vacuum tube:

(n) : an electrical device containing a heated filament inside an evacuated container (generally a glass tube) and used to produce rectification (a diode vacuum tube), amplification or other functions
Definition of vacuum tube:

(n) : an electrical device containing a heated filament inside an evacuated container (generally a glass tube) and used to produce rectification (a diode vacuum tube), amplification or other functions
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