Enter a clue or pattern or both:
The Clue
Vacuum tube (6 letter answer)
The Answer
TRIODE
Tags
Notes
The answer TRIODE is seen occasionally, appearing about once every 850 puzzles.
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Vacuum tube with three elements
Definition
TRIODE as a noun:
1. a thermionic vacuum tube having three electrodes; fluctuations of the charge on the grid control the flow from cathode to anode which making amplification possible