Ignitron
[ig-nahy-tron, ig-ni-tron] /ɪgˈnaɪ trɒn, ˈɪg nɪ trɒn/
noun, Electronics.
1.
a cathode-arc vacuum tube with an auxiliary electrode projecting into a pool of mercury: it conducts current when the anode is positive.
/ɪɡˈnaɪtrɒn; ˈɪɡnɪˌtrɒn/
noun
1.
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
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