thyratron

[ thahy-ruh-tron ]
/ ˈθaɪ rəˌtrɒn /

noun 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.

Origin of thyratron

1925–30; < Greek thýra door + -tron
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for thyratron

thyratron

/ (ˈθaɪrəˌtrɒn) /

noun

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 It has been superseded, except for application involving high-power switching, by the thyristor

Word Origin for thyratron

C20: originally a trademark, from Greek thura door, valve + -tron
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