thermosphere

play
noun ther·mo·sphere \ˈthər-mə-ˌsfir\

Definition of thermosphere

  1. :  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

thermospheric

play \ˌthər-mə-ˈsfir-ik, -ˈsfer-\ adjective

Recent Examples of thermosphere from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'thermosphere'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of thermosphere

International Scientific Vocabulary


First Known Use: circa 1950


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