The Collaborative International Dictionary
Galactic circle
Galactic \Ga*lac"tic\, a. [Gr. ? milky, fr. ?, ?, milk. See Galaxy, and cf. Lactic.]
Of or pertaining to milk; got from milk; as, galactic acid.
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Of or pertaining to the galaxy or Milky Way.
Galactic circle (Astron.), the great circle of the heavens, to which the course of the galaxy most nearly conforms.
--Herschel.Galactic poles, the poles of the galactic circle.