cathode spot
noun
1
: a small area of the anticathode of an X-ray tube upon which the cathode rays are focused and from which proceed the X rays
2
: a small area on the mercury cathode of a mercury-arc rectifier where the arc strikes it and liberates electrons
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“Cathode spot.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cathode%20spot. Accessed 1 Dec. 2024.
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