Astronomy Answers
From the Astronomical Dictionary

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The description of the word you requested from the astronomical dictionary is given below.

galactic

galaktos = [Greek] milk

Galactic means one of the following things:

1. that it has something to do with a galaxy.
2. that it has something to do with the Milky Way Galaxy, the galaxy that we are in.
3. that it has something to do with the location of the Milky Way Galaxy in the sky as seen from Earth.

The galactic coordinate system has the Milky Way (as seen from Earth) for base plane. The galactic latitude is measured relative to the plane of the Milky Way Galaxy, and the galactic longitude relative to the direction to the center of the Milky Way. Because of more accurate information about where the center of the Milky Way is, the old galactic coordinate system was replaced with a new and improved one a few decades ago.