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From The Collaborative International Dictionary of English v.0.48:
Galactic \Ga*lac"tic\, a. [Gr. ? milky, fr. ?, ?, milk. See Galaxy, and cf. Lactic.] 1. Of or pertaining to milk; got from milk; as, galactic acid. [1913 Webster] 2. Of or pertaining to the galaxy or Milky Way. [1913 Webster] 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. [1913 Webster]