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cold cathode

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cold cathode

–noun Electronics.
a cathode, in an electron tube (cold-cathode tube) or lamp, that emits electrons without having to be heated.

Origin:
1925–30
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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cold cathode

noun
a cathode that is a source of electrons without being heated 
WordNet® 3.0, © 2006 by Princeton University.
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