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Hint: Question mark (?) is a wildcard. Question mark substitutes one character.
English
noun
:
tetrode
1.
tetrode
(artifact)
a thermionic tube having four electrodes
Broader (hypernym)
electron tube
,
thermionic tube
,
thermionic vacuum tube
,
thermionic valve
,
tube
,
vacuum tube
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. English edition:
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.
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