alluvial sediment al·lu·vial·sediment uncommon noun 1. clay or silt or gravel carried by rushing streams and deposited where the stream slows down Synonymsalluvial sedimentalluvial depositalluviumalluvion Related words Broader terms sediment Narrower terms placer Part of alluvial soil WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
