Etymology
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galactic (adj.)

1839, "of the Milky Way, of the bright band of stars around the night sky," from Late Latin galacticus, from galaxias (see galaxy). In modern scientific sense "pertaining to (our) galaxy," from 1849. From 1844 as "of or pertaining to milk."

updated on February 04, 2015

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Definitions of galactic from WordNet

galactic (adj.)
of or relating to a galaxy (especially our galaxy the Milky Way);
the galactic plane
galactic (adj.)
inconceivably large;
Synonyms: astronomic / astronomical
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.