Definition of "pentode" [pentode]

• A thermionic valve similar to a tetrode with the addition of a suppressor grid; was used in high quality audio and radio products (noun)

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• "They had also miniaturized the beam pentode vacuum tube."
• "Graphical Symbol in full simplified diode, indirectly heated duodiode, indirectly heated or triode, indirectly heated or duotriode with separated cathodes, indirectly heated, heating filament with central tapping, internal screening of the system tetrode pentode, suppressor grid connected with cathode triode - pentode triode - heptode (according to the circuit, the systems may be drawn left-and-right reversed) 1.10."
• "Remember how he went to all the trouble of building a pentode vacuum tube for a job that could have been done by transistors he already had had a chance to get and didn't."