- 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.
Origin of alluvium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for alluvia
The source of the elements which compose the Pampean alluvia is very uncertain.The Argentine Republic
It was only in the extra-glacial tracts that alluvia of interglacial age were at all likely to be preserved in any abundance.
Hence, I believe that some of our so-called “post-glacial” alluvia will eventually be assigned to an interglacial horizon.
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
- a fine-grained fertile soil consisting of mud, silt, and sand deposited by flowing water on flood plains, in river beds, and in estuaries
C17: from Latin; see alluvion
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for alluvia
Online Etymology Dictionary, © 2010 Douglas Harper
- 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.
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