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lithosphere

[lith-uh-sfeer]
noun Geology.
  1. the solid portion of the earth (distinguished from atmosphere, hydrosphere).
  2. the crust and upper mantle of the earth.
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Origin of lithosphere

First recorded in 1885–90; litho- + -sphere
Also called ge·o·sphere [jee-uh-sfeer] /ˈdʒi əˌsfɪər/.
Related formslith·o·spher·ic [lith-uh-sfer-ik] /ˌlɪθ əˈsfɛr ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for geosphere

geosphere

noun
  1. another name for lithosphere
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lithosphere

noun
  1. the rigid outer layer of the earth, having an average thickness of about 75 km and comprising the earth's crust and the solid part of the mantle above the asthenosphere
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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

Word Origin and History for geosphere

n.

1898, from geo- + sphere.

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lithosphere

n.

"solid part of the earth's surface," 1881; see litho- "stone" + sphere.

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Online Etymology Dictionary, © 2010 Douglas Harper

geosphere in Science

lithosphere

[lĭthə-sfîr′]
  1. The outer part of the Earth, consisting of the crust and upper mantle. It is about 55 km (34 mi) thick beneath the oceans and up to about 200 km (124 mi) thick beneath the continents. The high velocity with which seismic waves propagate through the lithosphere suggests that it is completely solid. Compare asthenosphere atmosphere hydrosphere.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

geosphere in Culture

lithosphere

[(lith-uh-sfeer)]

The outer layer of the Earth, comprising the crust and the upper part of the mantle. The lithosphere is about sixty miles thick.

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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.