noun Geology.

a portion of the earth's crust subjected to downward warping during a large span of geologic time; a geosynclinal fold.

Origin of geosyncline

First recorded in 1890–95; geo- + syncline Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for geosyncline

Historical Examples of geosyncline

British Dictionary definitions for geosyncline



a broad elongated depression in the earth's crust containing great thicknesses of sediment
Derived Formsgeosynclinal, 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

Word Origin and History for geosyncline

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

Online Etymology Dictionary, © 2010 Douglas Harper

geosyncline in Science



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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.