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geosyncline (n.)
[geosyncline 词源字典]
1895, probably a back-formation from adjective
geosynclinal
(1879); see
geo-
+
synclinal
.
Geosynclinal
was used as a noun meaning "a region of depression" from 1873.
[geosyncline etymology, geosyncline origin, 英语词源]