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.
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British Dictionary definitions for thyratron
electronics a gas-filled tube that has three electrodes and can be switched between an `off' state and an `on' state. It has been superseded, except for application involving high-power switching, by the thyristor
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012