[sing-klahyn, sin-]
noun Geology.
a synclinal fold.

1870–75; back formation from synclinal Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
syncline (ˈsɪŋklaɪn)
Compare anticline a downward fold of stratified rock in which the strata slope towards a vertical axis
[C19: from syn- + Greek klīnein to lean]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
syncline   (sĭn'klīn')  Pronunciation Key 

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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 © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The interpretation for the geology is that the quarry exposes a major syncline in the marble.
The surface trace of the axis of a plunging syncline.
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