phanotron
noun
phan·o·tron
variants or less commonly phanatron
ˈfanə‧ˌträn
plural -s
: a low-pressure diode filled with mercury vapor or an inert gas and used as a rectifier for radio transmitters and industrial direct current power
Word History
Etymology
perhaps from Greek phano- showing (from phainein to show) + English -tron