a deposit of sand, mud, etc., formed by flowing water.
the sedimentary matter deposited thus within recent times, especially in the valleys of large rivers.
Historical Examples

The source of the elements which compose the Pampean alluvia is very uncertain.
The Argentine Republic Pierre Denis

It was only in the extra-glacial tracts that alluvia of interglacial age were at all likely to be preserved in any abundance.
Fragments of Earth Lore James Geikie

Hence, I believe that some of our so-called “post-glacial” alluvia will eventually be assigned to an interglacial horizon.
Fragments of Earth Lore James Geikie

Then comes the Negro down in the alluvia, with dark skin, woolly hair, and prognathous development.
History of the Negro Race in America From 1619 to 1880. Vol 1 George W. Williams

We see clearly the alluvia of two streams converging from right and left, and uniting to pass to the sea through Brading Harbour.
The Geological Story of the Isle of Wight J. Cecil Hughes

noun (pl) -viums, -via (-vɪə)
a fine-grained fertile soil consisting of mud, silt, and sand deposited by flowing water on flood plains, in river beds, and in estuaries

“matter deposited by flowing water,” 1660s, from Medieval Latin alluvium, neuter of alluvius “washed against,” from Latin alluere “wash against,” from ad- “to, against” (see ad-) + -luere, comb. form of lavere “to wash” (see lave).
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

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    of or relating to . alluvial soil. Australia. gold-bearing alluvial soil. Contemporary Examples The ground was fertile, with alluvial, or unconsolidated, soil. Ester Elchies, The Estate Built By Whiskey December 9, 2014 Historical Examples There is no alluvial soil, or bottoms along the streams, or grass in the forests. A New Guide for Emigrants to […]

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  • Alluvial cone

    a fan-shaped alluvial deposit formed by a stream where its velocity is abruptly decreased, as at the mouth of a ravine or at the foot of a mountain. noun a fan-shaped accumulation of silt, sand, gravel, and boulders deposited by fast-flowing mountain rivers when they reach flatter land alluvial fan (ə-l’vē-əl) A fan-shaped mass of […]

  • Alluvial fan

    a fan-shaped alluvial deposit formed by a stream where its velocity is abruptly decreased, as at the mouth of a ravine or at the foot of a mountain. Historical Examples Steep valleys descend from the higher country to join the main valley and at the mouth of every tributary is an alluvial fan. The Andes […]

  • Alluvial mining

    noun a method of extracting minerals by dredging alluvial deposits Historical Examples Several of the alluvial mining companies are getting gold in increased quantities. A Boy’s Voyage Round the World The Son of Samuel Smiles

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