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thyratron

[thahy-ruh-tron] /ˈθaɪ rəˌtrɒn/
noun, 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.
Origin of thyratron
1925-1930
1925-30; < Greek thýra door + -tron
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for thyratron

thyratron

/ˈθaɪrəˌtrɒn/
noun
1.
(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 It has been superseded, except for application involving high-power switching, by the thyristor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
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
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