noun, plural colluvia [kuh-loo-vee-uh] , colluviums. Geology.
loose earth material that has accumulated at the base of a hill, through the action of gravity, as piles of talus, avalanche debris, and sheets of detritus moved by soil creep or frost action.

1935–40; < Neo-Latin, equivalent to Latin colluv-, base of colluere to wash out (see collutory) + -ium -ium, on the model of Latin alluvium alluvium, dīluvium deluge

colluvial, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
colluvium (kəˈluːvɪəm)
n , pl -via, -viums
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]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
colluvium   (kə-l'vē-əm)  Pronunciation Key 
Plural colluviums or colluvia
A loose deposit of rock debris accumulated through the action of rainwash or gravity at the base of a gently sloping cliff or slope.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Colluvium in the basin was unsaturated immediately prior to, and during debris flows.
Parent material of alluvium and colluvium derived from sedimentary and metamorphic rock comprises these soils.
Primary geomorphic units in the basin include exposed bedrock and sandy colluvium.
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