• synonyms


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

First recorded in 1890–95; geo- + syncline
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for geosyncline

Historical Examples

  • The mountain range can only arise where the geosyncline is deeply filled by long ages of sedimentation.

    The Birth-Time of the World and Other Scientific Essays

    J. (John) Joly

British Dictionary definitions for geosyncline


  1. a broad elongated depression in the earth's crust containing great thicknesses of sediment
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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.

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Online Etymology Dictionary, © 2010 Douglas Harper

geosyncline in Science


  1. A usually elongate, basinlike depression along the edge of a continent, in which a thick sequence of sediments and volcanic deposits has accumulated.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.