Etymograph

English

exobase

From exo- + base.

Formed from exo- + base

Proto-Indo-European *h₁eǵʰs ‘out of’

Proto-Hellenic *eks

Ancient Greek ἐκ ‘Out of, from’

Ancient Greek ἔξω ‘outer’

English exo-

Proto-Indo-European *gʷem- ‘to come’

…

Ancient Greek βᾰ́σῐς ‘stepping’

Latin basis ‘a pedestal’

Old French base

Middle English base ‘a foundation or base’

English base

Today it means

noun The base altitude of the exosphere, where particles often escape the atmosphere as it blends into space.

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

Etymograph / exobase