synclinal

adjective
syn·​cli·​nal | \ (ˌ)sin-ˈklī-nᵊl \

Definition of synclinal

1 : inclined down from opposite directions so as to meet
2 : having or relating to a folded rock structure in which the sides dip toward a common line or plane

First Known Use of synclinal

1833, in the meaning defined at sense 1

History and Etymology for synclinal

Greek syn- + klinein to lean — more at lean

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The first known use of synclinal was in 1833

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to gather or build up little by little

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