noun Geology.
an anticlinal rock structure.

1860–65; back formation from anticlinal Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
anticline (ˈæntɪˌklaɪn)
Compare syncline a formation of stratified rock raised up, by folding, into a broad arch so that the strata slope down on both sides from a common crest

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1867, earlier anticlinal (1849, by ellipsis from anticlinal fold), from Gk. anti- "against" + klinein "to lean, slope." Form assimilated to incline.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
anticline   (ān'tĭ-klīn')  Pronunciation Key 

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A fold of rock layers that slope downward on both sides of a common crest. Anticlines form when rocks are compressed by plate-tectonic forces. They can be as small as a hill or as large as a mountain range. Compare syncline.
The American Heritage® Science Dictionary
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