alluvial.

formed from or relating to sediment deposited by flowing water

Use it for

Words that belong together

• alluvial soil
• alluvial plain
• alluvial deposits

On the page

The village stood on an alluvial plain.

Fresh alluvial deposits marked the river's former course.

Alluvial soil filled the low ground beside the channel.

Usage notes

Primary curation section: Environment. Usually associated with rivers and floodplains. Does not automatically mean fertile or muddy, though alluvial soil may be both. Normally non-gradable; no standard comparative or superlative. Related noun: alluvium.