What does "floodplain" mean?

A low-lying plain adjacent to a river subject to flooding during periods of high rainfall or at high tide.

How do you pronounce "floodplain"?

Pronounced //ˈflʌdˌpleɪn//.

Common synonyms include: alluvial plain, arales, bottomland, flood plain, flood-prone region, floodable land.

/ˈflʌdˌpleɪn/ noun

noun ·Rare ·Advanced level

Noun

1
A low-lying plain adjacent to a river subject to flooding during periods of high rainfall or at high tide.
"Near-synonyms: bottomland, bottomlands"
2
a low plain adjacent to a river that is formed chiefly of river sediment and is subject to flooding wordnet

"Near-synonyms: bottomland, bottomlands"

From flood + plain.