me·​so·​sphere | \ ˈme-zə-ˌsfir How to pronounce mesosphere (audio) , ˈmē-, -sə- \

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 How to pronounce mesospheric (audio) , ˌmē-​ , -​sə-​ , -​ˈsfer-​ \ adjective

Examples of mesosphere in a Sentence

Recent Examples on the Web World View plans to use a balloon to take tourists to what part of Earth's atmosphere: the stratosphere, the mesosphere, or the troposphere? CNN, "CNN 10 - April 17, 2020," 16 Apr. 2020 His popularity, based on the raft of toys, fashion collaborations and multimillion dollar auction results, hovers somewhere near the mesosphere. Max Lakin, New York Times, "KAWS Looks to the Fringes for Inspiration," 20 Feb. 2020 But sussing out what gives the dunes their dazzling gleam might help researchers figure out what’s going on in the mesosphere as well. Katherine J. Wu, Smithsonian Magazine, "A New Type of Aurora Ripples Across the Sky in Horizontal Green ‘Dunes’," 29 Jan. 2020 Palmroth and these citizen scientists have already broken ground on dune aurora research and are hoping that additional analysis will unlock more information about the mysterious mesosphere. Daisy Hernandez, Popular Mechanics, "How Citizen Scientists Helped Discover a New Aurora," 3 Feb. 2020 This is the first time that Virgin Galactic has flown into the mesosphere, Ars reports. Eric Berger, Ars Technica, "Rocket Report: Japan chasing SpaceX, missile-test failure, Russian trolling," 3 Aug. 2018 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,, "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 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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Time Traveler for mesosphere

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The first known use of mesosphere was in 1950

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Cite this Entry

“Mesosphere.” Dictionary, Merriam-Webster, Accessed 10 Jul. 2020.

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