n. An area of ground reclaimed from a sea or lake by means of dikes.
the GNU version of the Collaborative International Dictionary of English
n. A tract of low land reclaimed from the sea by of high embankments.
The Century Dictionary and Cyclopedia
n. A boggy or marshy soil; a morass; specifically, a tract of marshy land in the Netherlands, Flanders, and northern Germany, which has been reclaimed and brought under cultivation.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. low-lying land that has been reclaimed and is protected by dikes (especially in the Netherlands)
Word Usage
"You can keep following the Vecht to where it breaks into open polder land, viewing, while you're at it, the system of fortifications that used flooding as a military defense system for the country."