Ge′o‐syn‐cli″nal (?), n. [Gr. γέα, γη̑, the earth + E. synclinal.] (Geol.) the downward bend or subsidence of the earth's crust, which allows of the gradual accumulation of sediment, and hence forms the first step in the making of a mountain range; — opposed to geanticlinal.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.