from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. 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.
from the GNU version of the Collaborative International Dictionary of English
- n. 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 The Century Dictionary and Cyclopedia
- n. In geology, a region of depression, having, consequently, a synclinal structure. See geanticlinal.
- Having the characters of a geosyncline.
geo- + synclinal (Wiktionary)