Definition of exoatmospheric in English:

exoatmospheric

adjective

  • Operating or taking place outside the atmosphere.

    ‘an exoatmospheric re-entry vehicle’
    • ‘As a ground-based, high-altitude weapon system, it will use exoatmospheric and endoatmospheric hit-to-kill interceptors to destroy missiles.’
    • ‘Its emphasis is on the exoatmospheric ascent phase for intercept.’
    • ‘They consist of an exoatmospheric kill vehicle integrated with a booster that launches it into space.’

Pronunciation:

exoatmospheric

/ˌɛksəʊˌatməsˈfɛrɪk/