thermosphere

[thur-muh-sfeer]
noun
the region of the upper atmosphere in which temperature increases continuously with altitude, encompassing essentially all of the atmosphere above the mesosphere.

Origin:
1950–55; thermo- + sphere

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
thermosphere (ˈθɜːməˌsfɪə)
 
n
an atmospheric layer lying between the mesosphere and the exosphere, reaching an altitude of about 400 kilometres where the temperature is over 1000°C

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
thermosphere  [%PREMIUM_LINK%]     (thûr'mə-sfîr')  Pronunciation Key 
The region of the Earth's upper atmosphere lying above the mesosphere and extending from a height of approximately 80 km (50 mi) to between 550 and 700 km (341 and 434 mi) above the Earth's surface. In the thermosphere temperatures increase steadily with altitude, reaching as high as 1,727°C (3,140°F) at the highest elevations. Chemical reactions occur much faster here than on the surface of the Earth. See also exosphere, mesosphere, stratosphere, troposphere., See illustration at atmosphere.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

thermosphere

region of increasing temperature in Earth's atmosphere that is located above the mesosphere. The base of the thermosphere (the mesopause) is at an altitude of about 80 km (50 miles), whereas its top (the thermopause) is at about 450 km.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The upper limit of the thermosphere is referred to as the exosphere.
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