of or pertaining to alluvium.
alluvial soil.
Australia. gold-bearing alluvial soil.

1795–1805; alluvi(um) + -al1

nonalluvial, adjective, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
alluvial (əˈluːvɪəl)
1.  of or relating to alluvium
2.  another name for alluvium
3.  (Austral), (NZ) alluvium containing any heavy mineral, esp gold

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1802, from L. alluvius "alluvial" (see alluvium).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
alluvium   (ə-l'vē-əm)  Pronunciation Key 
Plural alluviums or alluvia
Sand, silt, clay, gravel, or other matter deposited by flowing water, as in a riverbed, floodplain, delta, or alluvial fan. Alluvium is generally considered a young deposit in terms of geologic time.

alluvial adjective
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Let there be iron oxides and copper and magnesium and mica to form alluvial fans and washes and canyons and mud hills.
Horses, cows and countless birds grazed on the wide alluvial fill separating shore from lake.
Stupendous wealth was sucked into an alluvial delta containing a population of fewer than two million.
Almost anyone, however, can set up a small-scale alluvial-mining operation.
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