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Meaning of ignitron

ig•ni•tron

Pronunciation: (ig-nī'tron, ig'ni-tron), [key]
— n. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.