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cold cathode

noun, Electronics.
1.
a cathode, in an electron tube (cold-cathode tube) or lamp, that emits electrons without having to be heated.
Origin
1925-1930
1925-30
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for cold cathode tube

cold cathode

noun
1.
(electronics) a cathode from which electrons are emitted at ambient temperature, due to a high potential gradient at the surface
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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