(redirected from colluvial)
Also found in: Encyclopedia.


n. pl. col·lu·vi·ums or col·lu·vi·a (-vē-ə)
A loose deposit of rock debris accumulated through the action of gravity at the base of a cliff or slope.

[Latin, a collection of washings, dregs, from colluere, to wash thoroughly : com-, intensive pref.; see com- + -luere, to wash; see leu(ə)- in Indo-European roots.]

col·lu′vi·al adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


n, pl -via (-vɪə) or -viums
(Geological Science) a mixture of rock fragments from the bases of cliffs
[Latin: collection of filth, from colluere to wash thoroughly, from com- (intensive) + luere to wash]
colˈluvial adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(kəˈlu vi əm)

n., pl. -vi•a (-vi ə) -vi•ums.
loose earth material that has accumulated at the base of a slope; talus.
[1935–40; < Latin colluv-, base of colluere to rinse, wash out <lavere to wash; compare alluvium, deluge]
col•lu′vi•al, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Colluvial concentrations are present, similar to those seen at Espigao do Oeste.
The boulder layer is overlain by colluvial deposits--massive fine-grained sands, moderately sorted (Mz = 2.20-2.48 phi, [[sigma].sub.1] = 0.81-0.97 phi).
Torrent salamanders tend to occur and are frequently more abundant in stream-network headwaters (Hunter 1998; Wilkins and Peterson 2000; Kroll and others 2008), which are dominated by colluvial processes (Montgomery and Buffington 1998; Gomi and others 2002).
3c), reflecting a colluvial contribution to this part of the profile.
Rotated and overturned downthrown blocks cut by secondary scarps, were visible within the landslide colluvium, and a colluvial bulge developed, passing into the landslide tongue zone, which covered the terraced part of the slope at the level of the reconstructed building (Fig.
Wu et al., "Determination of the embedded length of stabilizing piles in colluvial landslides with upper hard and lower weak bedrock based on the deformation control principle," Bulletin of Engineering Geology and the Environment, pp.
A consequence of these types of geomorphological processes is a sporadic accumulation of eroded colluvial deposits on the slopes; these deposits can be susceptible to sliding [6].
The materials filling the basin during the most recent (Quaternary) period are lacustrine, fluvial (terraces and alluvial deposits), colluvial, eolian (coastal dunes, mantles), and from marshes formed by the closure of different river estuaries (Moreira, 2003).