Definition of syncline noun from the Oxford Advanced Learner's Dictionary

 

syncline

 noun
noun
BrE BrE//ˈsɪŋklaɪn//
 
; NAmE NAmE//ˈsɪŋklaɪn//
 
(geology)
 
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an area of ground where layers of rock in the earth’s surface have been folded into a curve that is lower in the middle than at the ends compare anticline Word Origin late 19th cent.: from syn- ‘together’ + Greek klinein ‘to lean’, on the pattern of incline.
See the Oxford Advanced American Dictionary entry: syncline