Definitions

1. noun

Plural of alluvium, a deposit of sand, silt, or clay carried by a river, especially one deposited at the river mouth or along its floodplain.

“The geologist studied the alluviviums to understand the river’s history and changes over time.”

2. noun

Plural of alluvion, a layer of sediment deposited by a river.

“The team excavated the alluviviums to uncover ancient fossils and artifacts.”