[sing-klahyn, sin-]

noun Geology.

a synclinal fold.

Origin of syncline

First recorded in 1870–75; back formation from synclinal Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for syncline

Historical Examples of syncline

British Dictionary definitions for syncline



a downward fold of stratified rock in which the strata slope towards a vertical axisCompare anticline
Derived Formssynclinal, adjective

Word Origin for syncline

C19: from syn- + Greek klīnein to lean
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 syncline

1873, back-formation from synclinal.

Online Etymology Dictionary, © 2010 Douglas Harper

syncline in Science



A fold of rock layers that slope upward on both sides of a common low point. Synclines form when rocks are compressed by plate-tectonic forces. They can be as small as the side of a cliff or as large as an entire valley. Compare anticline.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.