Dictionary

thermosphere

noun ther·mo·sphere \ˈthər-mə-ˌsfir\

Definition of THERMOSPHERE

:  the part of the earth's atmosphere that begins at about 50 miles (80 kilometers) above the earth's surface, extends to outer space, and is characterized by steadily increasing temperature with height
ther·mo·spher·ic \ˌthər-mə-ˈsfir-ik, -ˈsfer-\ adjective

Origin of THERMOSPHERE

International Scientific Vocabulary
First Known Use: circa 1950

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