low-lying land that has been reclaimed and is protected by dikes (especially in the Netherlands)
An area of ground reclaimed from a sea or lake by means of dikes.
To reclaim an area of ground from a sea or lake by means of dikes.
The word "polder" comes from the Dutch language, where it originally referred to land reclaimed from water. Its exact roots are unclear, though it evolved through Middle and Old Dutch forms before entering English.