Definitions

1. noun

soil or sediment deposited by a river or other natural agency

“The geologist studied the alluvium in the river delta to understand its geological history.”

2. noun

a deposit of material, especially sand or silt, transported by a river and deposited elsewhere

“The alluvium along the riverbank was rich in nutrients and supported a diverse ecosystem.”

3. noun

a deposit of sediment or sand, especially in a river delta or estuary

“The alluvium in the estuary was an important habitat for migratory birds.”