geosyncline

noun
geo·​syn·​cline | \ ˌjē-ō-ˈsin-ˌklīn How to pronounce geosyncline (audio) \

Definition of geosyncline

: a great downward flexure of the earth's crust

Other Words from geosyncline

geosynclinal \ ˌjē-​ō-​ˌsin-​ˈklī-​nəl How to pronounce geosynclinal (audio) \ adjective

First Known Use of geosyncline

1895, in the meaning defined above

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The first known use of geosyncline was in 1895

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Britannica.com: Encyclopedia article about geosyncline

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