dark space

English

Noun

dark space (plural dark spaces)

  1. any of several regions in a glow discharge in which little or no light is produced
  2. (astronomy) the intergalactic void
  3. (literal) Used other than figuratively or idiomatically: see dark,‎ space.

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Further reading

  • Massachusetts Institute of Technology, Applied Electronics, 1943, John Wiley, pp 144–150