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galactic plane

noun

, Astronomy.
  1. the plane of the galactic equator.


galactic plane

noun

  1. the plane passing through the spiral arms of the Galaxy
“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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Word History and Origins

Origin of galactic plane1

First recorded in 1840–50
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Example Sentences

In the 1950s, astronomers first spotted a radio wave-emitting arc hanging above — or to the “north” of — the galactic plane.

As we ascend from the galactic plane we perceive that the density decreases with great rapidity.

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Galacticogalactic pole