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phanotron

[fan-uh-tron]
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noun Electronics.
  1. a hot-cathode gas diode.
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Origin of phanotron

1930–35; perhaps < Greek phan(ázein) to appear + -o- -o- + -tron
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018