/ Dictionary / Index T thyratron: Meaning and Definition of Find definitions for: thy•ra•tron Pronunciation: (thī'ru-tron"), [key] — n. Electronics. 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. Thyone thyristor Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language