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floodplain

1 ENTRIES FOUND:
floodplain /ˈflʌdˌpleɪn/ noun
plural floodplains
floodplain
/ˈflʌdˌpleɪn/
noun
plural floodplains
Britannica Dictionary definition of FLOODPLAIN
[count]
1 
: an area of low, flat land along a stream or river that may flood
2 
: an area of land built up from soil left by floods