pentode
Noun
Meaning
a thermionic tube having five electrodes
Source: WordNetSynonyms
metro
flue
channel
grid
cylinder
amplifier
cathode
anode
filament
cry
duct
hose
conduit
diode
cathode-ray tube
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Later tetrodes had anodes treated to reduce secondary emission; earlier ones such as the type 77 sharp-cutoff pentode connected as a tetrode made better dynatrons.
To further reduce the cost and complexity of radio equipment, two separate structures (triode and pentode for instance) could be combined in the bulb of a single multisection tube.