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/ˈpɛn.təʊd/ · noun
A thermionic valve similar to a tetrode with the addition of a third grid, the suppressor grid to reduce the secondary emission effect; was/is used in high quality audio and radio products..
Use pentode when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Pentode means A thermionic valve similar to a tetrode with the addition of a third grid, the suppressor grid to reduce the secondary emission effect; was/is used in high quality audio and radio products..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use pentode where its definition matches the intended context.
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