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geosyncline

[jee-oh-sin-klahyn] /ˌdʒi oʊˈsɪn klaɪn/
noun, Geology
1.
a portion of the earth's crust subjected to downward warping during a large span of geologic time; a geosynclinal fold.
Origin
1890-1895
1890-95; geo- + syncline
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for geosyncline

geosyncline

/ˌdʒiːəʊˈsɪŋklaɪn/
noun
1.
a broad elongated depression in the earth's crust containing great thicknesses of sediment
Derived Forms
geosynclinal, 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
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Word Origin and History for geosyncline
n.

1895, back-formation from geosynclinal (1873); see geo- + synclinal.

Online Etymology Dictionary, © 2010 Douglas Harper
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geosyncline in Science
geosyncline
  (jē'ō-sĭn'klīn')   
A usually elongate, basinlike depression along the edge of a continent, in which a thick sequence of sediments and volcanic deposits has accumulated.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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