Dictionary

floodplain

noun flood·plain \ˈfləd-ˌplān\

: an area of low, flat land along a stream or river that may flood

: an area of land built up from soil left by floods

Full Definition of FLOODPLAIN

1
:  level land that may be submerged by floodwaters
2
:  a plain built up by stream deposition

First Known Use of FLOODPLAIN

1873

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