[ uh-loo-vee-uhm ]
See synonyms for alluvium on
noun,plural al·lu·vi·ums, al·lu·vi·a [uh-loo-vee-uh]. /əˈlu vi ə/.
  1. a deposit of sand, mud, etc., formed by flowing water.

  2. the sedimentary matter deposited thus within recent times, especially in the valleys of large rivers.

Origin of alluvium

1655–65; <Latin, noun use of neuter of alluvius washed against, equivalent to alluv- (see alluvion) + -ius, -ium adj. suffix; see -ium

Words Nearby alluvium Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use alluvium in a sentence

British Dictionary definitions for alluvium


/ (əˈluːvɪəm) /

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

Origin of alluvium

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

Scientific definitions for alluvium


[ ə-lōōvē-əm ]

Plural alluviums alluvia
  1. 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.

Other words from alluvium

  • alluvial adjective

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