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Noun Region Atmosphere Exosphere Exo·Sphere  International Scientific  The

Title exosphere
Text
Merriam-Webster's Collegiate Dictionary
exo·sphere

 \\ˈek-sō-ˌsfir\\ noun
 ETYMOLOGY  International Scientific Vocabulary
 DATE  1949
: the outer fringe region of the atmosphere of the earth or a celestial body (as a planet)
• exo·spher·ic 
 
 \\ˌek-sō-ˈsfir-ik, -ˈsfer-\\ adjective
Oxford Advanced Learner's Dictionary-牛津双解-OALD7
exosphere
exo·sphere 5eksEusfiE(r)NAmE 5eksousfir / nounthe exosphere [sing.] 
   the region near the edge of a planet's atmosphere
   外层,外逸层(行星大气的最外层)
Webster's Third New International Dictionary, Unabridged
exo·sphere
\ˈeksō+ˌ-\ noun
Etymology: International Scientific Vocabulary exo- + sphere
: the outer fringe region of the atmosphere variously estimated to begin at an altitude of 200 to 600 miles

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