Octode definitions

Octode

1) Vacuum tube
Found on https://www.crosswordclues.com/clue/octode

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octode

an eight-electrode electronic tube containing an anode, a cathode, a control electrode, and five additional electrodes
Found on http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=531-31-07

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