English

exogalactic

From exo- + galactic.

Proto-Indo-European *h₁eǵʰs ‘out of’

Proto-Hellenic *eks

Ancient Greek ἐκ ‘Out of, from’

Ancient Greek ἔξω ‘outer’

English exo-

Ancient Greek γάλα ‘milk’

Ancient Greek γαλακτικός ‘milky’

Today it means

adj Synonym of extragalactic (originating from outside the Milky Way galaxy)

Language periods are conventional ranges, not dates for this word.

Etymograph / exogalactic