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extra-galactic
extra-galactic adj.
Brit. 
/ˌɛkstrəɡəˈlaktɪk/
, /ˌɛkstrəɡəˈlaktɪk/U.S. /ˌɛkstrəɡəˈlæktɪk/
Astronomy outside the galaxy or Milky-way./ˌɛkstrəɡəˈlæktɪk/ΚΠ
1851 J. P. Nichol Archit. Heavens (ed. 9) 110 An extra-galactic phenomenon.
1870 R. A. Proctor Other Worlds than Ours xi. 264 The scattered stars of very low magnitudes in the extragalactic heavens.
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