geosyncline

noun geo·syn·cline \ ˌjē-ō-ˈsin-ˌklīn \

Definition of geosyncline

: a great downward flexure of the earth's crust

geosynclinal

play \ˌjē-ō-ˌsin-ˈklī-nəl\ adjective

First Known Use of geosyncline

1895

in the meaning defined above

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