exospheric

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ex·o·sphere

(ĕk′sō-sfîr′)

1. The outermost region of a planet's atmosphere.

2. The outermost region of the earth's atmosphere, lying above the thermosphere and extending thousands of kilometers into space, from which molecules having sufficient velocity can escape the earth's gravitation.

ex′o·spher′ic (-sfîr′ĭk, -sfĕr′-) adj.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

exospheric

(ˌɛksəʊˈsfɛrɪk) or

exospherical

adj

(Physical Geography) of or relating to the exosphere

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