ignitron

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Related to ignitrons: Thyratron, Thyristors

ig·ni·tron

 (ĭg-nī′trŏn′, ĭg′nĭ-)
n.
A single-anode, mercury-vapor rectifier in which current passes as an arc between the anode and a mercury-pool cathode, used in power rectification.

ignitron

(ɪɡˈnaɪtrɒn; ˈɪɡnɪˌtrɒn)
n
(Electronics) a mercury-arc rectifier controlled by a subsidiary electrode, the igniter, partially immersed in a mercury cathode. A current passed between igniter and cathode forms a hot spot sufficient to strike an arc between cathode and anode
[C20: from igniter + electron]

ig•ni•tron

(ɪgˈnaɪ trɒn, ˈɪg nɪ trɒn)

n.
a rectifying vacuum tube with an auxiliary electrode projecting into a pool of mercury that conducts current when the anode is positive.
[1930–35; igni (te) + -tron]