ignitron

noun
ig·​ni·​tron | \ig-ˈnī-ˌträn \

Definition of ignitron 

: a mercury-containing rectifier tube in which the arc is struck again at the beginning of each cycle by a special electrode separately energized by an auxiliary circuit

First Known Use of ignitron

1933, in the meaning defined above

History and Etymology for ignitron

Latin ignis fire + English -tron

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The first known use of ignitron was in 1933

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