One of the mysteries of the English language finally explained.
A kind of topography resembling karst in ground other than limestone, produced by subterranean erosion rather than solution of rock.
1950s. From pseudo- + karst, ultimately after German Pseudo-Verkarstung (W. von Knebel Höhlenkunde xix. 183; the usual German term is Pseudokarst). Compare Italian pseudocarsismo (noun), pseudocarsico (adjective).
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