from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Sediment deposited by flowing water, as in a riverbed, flood plain, or delta.

from The Century Dictionary.

  • noun A deposit, usually of mingled sand and mud, resulting from the action of fluviatile currents: applied by geologists to the most recent sedimentary deposits, especially such as occur in the valleys of large rivers: opposed to diluvium (which see).

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Geol.) Deposits of earth, sand, gravel, and other transported matter, made by rivers, floods, or other causes, upon land not permanently submerged beneath the waters of lakes or seas.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun soil, clay, silt or gravel deposited by flowing water, as it slows, in a river bed, delta, estuary or flood plain

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun clay or silt or gravel carried by rushing streams and deposited where the stream slows down


from The American Heritage® Dictionary of the English Language, 4th Edition

[Medieval Latin, flood, from neuter of Latin alluvius, alluvial, from alluere, to wash against; see alluvion.]


Help support Wordnik (and make this page ad-free) by adopting the word alluvium.



Log in or sign up to get involved in the conversation. It's quick and easy.

  • Railroad telegraphers' shorthand for "are willing to agree". --US Railway Association, Standard Cipher Code, 1906.

    January 19, 2013