Definitions

from The Century Dictionary.

  • Having the characters of a geosyncline.
  • noun In geology, a region of depression, having, consequently, a synclinal structure. See geanticlinal.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geology The downward bend or subsidence of the Earth's crust, which permits the gradual accumulation of sediment and hence forms the first step in the formation of a mountain range.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

geo- +‎ synclinal

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