Definition of extragalactic in English:

extragalactic

adjective

Astronomy
  • Situated, occurring, or originating outside the Milky Way galaxy.

    ‘extragalactic radio sources’
    • ‘And on extragalactic scales, they even expect to study individual stars around black holes.’
    • ‘Astronomers can determine the composition and temperature of extragalactic material by analyzing the way radiation passing through it is distributed along an infrared spectrum.’
    • ‘It is definitely an extragalactic background.’
    • ‘The number of these sources is consistent with the expected number of extragalactic sources in the background sky.’
    • ‘Hence the whole foundation of extragalactic astronomy and Big Bang theory is swept away’ .’

Pronunciation:

extragalactic

/ˌekstrəɡəˈlaktik/