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Meaning of thyratron

thy•ra•tron

Pronunciation: (thī'ru-tron"), [key]
— n. Electronics.
  1. a gas-filled, hot-cathode tube in which one or more control electrodes initiate, but do not limit and cannot interrupt, the flow of electrons.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.