I. əˈlüvēəl, -vyəl also aˈ- or əlˈyü- or alˈyü- adjective
also al·lu·vi·an -ən
Etymology: alluvi um + -al or -an
1. : relating to or composed of alluvium
alluvial soil
an alluvial divide
2. : found in alluvium
alluvial diamonds
II. noun
( -s )
1.
a. : alluvial soil
b. Australia : gold-bearing alluvial soil
2. : a mineral occurring in placer deposits