noun, noun which may take the genitive case particle 'no'
alluvial
Geological term referring to soil, deposits, or land formed by river action. Often used in compounds like 沖積層 (alluvium) or 沖積平野 (alluvial plain).
The alluvial plain in this region is suitable for agriculture.
alluvium; alluvial stratum
alluvial period
alluvial series
alluvial plain
From 沖 (offshore, open water) and 積 (accumulate, deposit), referring to sediment deposited by water. The exact historical derivation is uncertain; the spelling is conventionally associated with alluvial processes.