galactic plane

noun Astronomy.
the plane of the galactic equator.

Origin:
1840–50

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
galactic plane
 
n
the plane passing through the spiral arms of the Galaxy

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Sot it's not in the galactic plane but slightly above it.
There may be a gradual increase in local gravity as the dark matter density
  increases during the crossing of the galactic plane.
As indicated in the article, there is much less medium for the expanding gas to
  interact with, being out of the galactic plane.
Our own solar system isn't even close to being aligned with the galactic plane.
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