[ trop-uh-sfeer, troh-puh- ]
See synonyms for troposphere on
  1. the lowest layer of the atmosphere, 6 miles (10 km) high in some areas and as much as 12 miles (20 km) high in others, within which there is a steady drop in temperature with increasing altitude and within which nearly all cloud formations occur and weather conditions manifest themselves.

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Origin of troposphere

First recorded in 1905–10; tropo- + sphere

Other words from troposphere

  • trop·o·spher·ic [trop-uh-sfer-ik, -sfeer-, troh-puh-], /ˌtrɒp əˈsfɛr ɪk, -ˈsfɪər-, ˌtroʊ pə-/, adjective

Words Nearby troposphere Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use troposphere in a sentence

  • Here, well above the troposphere, the air was thin and always clear.

    Islands of Space | John W Campbell
  • Investigators have noted the importance of rain or snow in washing fallout particles from the air in the troposphere.

    Atoms, Nature, and Man | Neal O. Hines
  • The dense reaches of the troposphere—the weather belt where storms are born—dropped below them.

    First on the Moon | Jeff Sutton
  • At last Ken leveled off in the troposphere, at an altitude of five miles.

    Fly By Night | Arthur Dekker Savage
  • In distinction from the stratosphere, the part of the atmosphere lying below it is called the troposphere.

    Meteorology | Charles Fitzhugh Talman

British Dictionary definitions for troposphere


/ (ˈtrɒpəˌsfɪə) /

  1. the lowest atmospheric layer, about 18 kilometres (11 miles) thick at the equator to about 6 km (4 miles) at the Poles, in which air temperature decreases normally with height at about 6.5°C per km

Derived forms of troposphere

  • tropospheric (ˌtrɒpəˈsfɛrɪk), adjective

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for troposphere


[ trōpə-sfîr′, trŏpə- ]

  1. The lowest and densest region of the Earth's atmosphere, extending from the Earth's surface to the tropopause. The troposphere is characterized by temperatures that decrease with increasing altitude. At the top of this region, temperatures are close to -55°C (-67°F). The weather, major wind systems, and cloud formations occur mostly in the troposphere. See also exosphere mesosphere stratosphere thermosphere. See illustration at atmosphere.

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Cultural definitions for troposphere


[ (troh-puh-sfeer, trop-uh-sfeer) ]

The lowest layer of the atmosphere of the Earth, extending from ground level to an altitude of seven to ten miles.

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.