Etymology
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polder (n.)

c. 1600, in reference to the Netherlands, Flanders, and Frisia, "boggy or marshy soil," especially a tract of marshy land which as been reclaimed and brought under cultivation, from Dutch polder, from Middle Dutch polre, related to East Frisian poller, polder, words of unknown origin.

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Definitions of polder

polder (n.)
low-lying land that has been reclaimed and is protected by dikes (especially in the Netherlands);
From wordnet.princeton.edu