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Definition of Pentode
1. Noun. A thermionic tube having five electrodes. 
Generic synonyms: Electron Tube, Thermionic Tube, Thermionic Vacuum Tube, Thermionic Valve, Tube, Vacuum Tube
Definition of Pentode
1. a type of electron tube [n -S]
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1. Noun. A thermionic tube having five electrodes. 
1. a type of electron tube [n -S]