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galactic plane

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

Origin of galactic plane

First recorded in 1840–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for galactic plane

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