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krytron

British  
/ ˈkraɪtrɒn /

noun

  1. electronics a type of fast electronic gas-discharge switch, used as a trigger in nuclear weapons

"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

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Great masses of warheads could quickly be rendered harmless by removing their tritium bottles and krytron triggers.

From Time Magazine Archive