follow Dictionary.com

Winning Words of the Scripps Spelling Bee

thermosphere

[thur-muh-sfeer] /ˈθɜr məˌsfɪər/
noun
1.
the region of the upper atmosphere in which temperature increases continuously with altitude, encompassing essentially all of the atmosphere above the mesosphere.
Origin of thermosphere
1950-1955
1950-55; thermo- + sphere
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
British Dictionary definitions for thermosphere

thermosphere

/ˈθɜːməˌsfɪə/
noun
1.
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for thermosphere
n.

1924, from thermo- + sphere.

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
thermosphere in Science
thermosphere
  (thûr'mə-sfîr')   
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.
Cite This Source

Word of the Day

Difficulty index for thermosphere

Few English speakers likely know this word

Word Value for thermosphere

0
22
Scrabble Words With Friends