syncline

noun
syn·​cline | \ˈsin-ˌklīn \

Definition of syncline 

: a trough of stratified rock in which the beds dip toward each other from either side — compare anticline

Illustration of syncline

Illustration of syncline

cross section of strata showing syncline

First Known Use of syncline

1873, in the meaning defined above

History and Etymology for syncline

back-formation from synclinal

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The first known use of syncline was in 1873

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