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anode glow

American  

noun

Physics.

  1. the luminous region between the positive column and the anode dark space in a vacuum tube, occurring when the pressure is low.

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.