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Definition of Floodplain
1. Noun. A low plain adjacent to a river that is formed chiefly of river sediment and is subject to flooding.
Definition of Floodplain
1. Noun. An alluvial plain that experiences occasional or periodic flooding. ¹
¹ Source: wiktionary.com
Definition of Floodplain
1. [n -S]
Medical Definition of Floodplain
1. Relatively flat surfaces adjacent to active stream or river channels, formed by deposition of sediments during major floods. The floodplain may be covered by water during floods: 100-year floodplain: That area that would be covered by water during the 100-year flood event. Historic floodplain: An area larger than the 100-year floodplain. (05 Dec 1998)