IPA: /ˈpoʊldər/
KK: /ˈpoʊldər/
A low area of land that has been taken from water, especially in the Netherlands, and is kept dry by walls called dikes.
The farmers in the polder grow crops on land that was once underwater.
The word 'polder' originates from Dutch 'polder', meaning a tract of low-lying land that has been reclaimed from a body of water, typically by means of dikes. It refers specifically to land that is below sea level and protected from flooding.
Imagine a piece of land that has been 'reclaimed' from water, which helps you remember that a 'polder' is a low-lying area made safe from flooding.