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ignitor

   Also found in: Dictionary/thesaurus, Legal, Wikipedia 0.01 sec.
ignitor [ig′nīd·ər]
(electronics)
An electrode used to initiate and sustain the discharge in a switching tube. Also known as keep-alive electrode (deprecated).
A pencil-shaped electrode, made of carborundum or some other conducting material that is not wetted by mercury, partly immersed in the mercury-pool cathode of an ignitron and used to initiate conduction at the desired point in each alternating-current cycle.
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