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Meaning of geosyncline

ge•o•syn•cline

Pronunciation: ( jē"ō-sin'klīn), [key]
— n. Geol.
  1. a portion of the earth's crust subjected to downward warping during a large span of geologic time; a geosynclinal fold.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.