Dictionary.com
Thesaurus.com

phanotron

American  
[fan-uh-tron] / ˈfæn əˌtrɒn /

noun

Electronics.
  1. a hot-cathode gas diode.


Etymology

Origin of phanotron

1930–35; perhaps < Greek phan ( ázein ) to appear + -o- -o- + -tron