mesosphere

noun
me·so·sphere | \-ˌsfir \

Definition of mesosphere 

: the part of the earth's atmosphere between the stratosphere and the thermosphere in which temperature decreases with altitude to the atmosphere's absolute minimum

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Other Words from mesosphere

mesospheric \ˌme-zə-ˈsfir-ik, ˌmē-, -sə-, -ˈsfer- \ adjective

Examples of mesosphere in a Sentence

Recent Examples on the Web

The study suggested that increased methane emissions — added to the atmosphere by humans extracting and burning fossil fuels — have increased water vapor concentrations in the mesosphere by about 40 percent since the late 1800s. Katie Camero, BostonGlobe.com, "Once-rare cloud is now more common, and new study says climate change is to blame," 13 July 2018 In fact, the mesosphere contains very little moisture — just a tiny fraction of the level of moisture in the air in the Sahara. Kathryn Prociv, Washington Post, "Extremely rare, colorful nighttime clouds shine over Arizona," 30 Mar. 2018 Noctilucent clouds are the highest clouds in Earth’s atmosphere, located in the mesosphere about 50 miles above the surface. Kathryn Prociv, Washington Post, "Extremely rare, colorful nighttime clouds shine over Arizona," 30 Mar. 2018 These mysterious, thin veils of clouds appear to form around Earth’s polar regions in the mesosphere, the highest level of Earth’s atmosphere. National Geographic, "Now Is the Best Time to See Electric-Blue Clouds at Night," 15 June 2016 Shoot a laser 56 miles into the mesosphere and measure the distortion. Noah Shachtman, WIRED, "50 Years of Real-Life Ray Guns," 14 May 2010 These mysterious, thin veils of clouds appear to form around the polar regions in the mesosphere, the highest level of Earth’s atmosphere. National Geographic, "Eerie Clouds Glow at Night—How to See Them," 22 June 2017

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

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First Known Use of mesosphere

1950, in the meaning defined above

History and Etymology for mesosphere

meso- + -sphere

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Dictionary Entries near mesosphere

mesosoma

mesosome

mesosomic

mesosphere

mesospore

Mesostoma

mesostyle

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Time Traveler for mesosphere

The first known use of mesosphere was in 1950

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More from Merriam-Webster on mesosphere

Britannica.com: Encyclopedia article about mesosphere

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