geosyncline

geosyncline

[jee-oh-sin-klahyn]
noun Geology.
a portion of the earth's crust subjected to downward warping during a large span of geologic time; a geosynclinal fold.

Origin:
1890–95; geo- + syncline

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Collins
World English Dictionary
geosyncline (ˌdʒiːəʊˈsɪŋklaɪn)
 
n
a broad elongated depression in the earth's crust containing great thicknesses of sediment
 
geosyn'clinal
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
geosyncline   (jē'ō-sĭn'klīn')  Pronunciation Key 
A usually elongate, basinlike depression along the edge of a continent, in which a thick sequence of sediments and volcanic deposits has accumulated.
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