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geosynclinal

[jee-oh-sin-klahyn-l]
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adjective
  1. Geology. pertaining to a synclinal fold that involves a relatively large part of the earth's surface.
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Origin of geosynclinal

First recorded in 1870–75; geo- + synclinal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018