al·​lu·​vi·​al | \ ə-ˈlü-vē-əl How to pronounce alluvial (audio) \

Definition of alluvial

 (Entry 1 of 2)

: relating to, composed of, or found in alluvium alluvial soil alluvial diamonds



Definition of alluvial (Entry 2 of 2)

: an alluvial deposit

Examples of alluvial in a Sentence

Recent Examples on the Web: Adjective Since the behavior of an alluvial river can change by the minute, the mathematics involved in making any kind of prediction of its future behavior is formidable, the task Sisyphean. Simon Winchester, Wired, "How Albert Einstein's Son Tamed the Mississippi River," 11 May 2020 Tucker planted tobacco in the rich alluvial soil and thus began to make his fortune. USA Today, "Pam’s family enslaved black people. Wanda believes her ancestor was one of them. They met, and are confronting a painful history," 17 Dec. 2019 The encampment eventually became buried more and more deeply as alluvial sands were washed up over the banks by occasional floods of the adjacent river., "Community News For The Farmington Valley Edition," 2 Dec. 2019 The communities that have traditionally relied on aflaj include towns in the mountains and in the sloping alluvial plains. Ian James, azcentral, "Ancient aqueducts in Oman imperiled by modern wells and climate change," 28 Nov. 2019 The world’s most productive rice growers, in Thailand and Vietnam, depend on the Mekong’s generosity in depositing rich alluvial soil during the rainy season. New York Times, "‘Our River Was Like a God’: How Dams and China’s Might Imperil the Mekong," 12 Oct. 2019 Khasi men and women sit by roadsides with ball-peen hammers reducing boulders to pebbles the size of peas that will descend to the plains not by stream but by lorry, there to feed an infrastructure boom on the alluvial plains of Bangladesh. The Economist, "The South Asian monsoon, past, present and future," 27 June 2019 The seabed is covered with some 80 meters of fine silt deposited by the alluvial flow from various rivers. New York Times, "Putin Opens Bridge to Crimea, Cementing Russia’s Hold on Neighbor," 15 May 2018 Montana, Idaho, and Washington are home to some of the tallest peaks on the continent, scattered across remote wildernesses, rainforests, alluvial plains, and a matrix of lake and river systems. Porter Fox, Outside Online, "Exploring America's Forgotten Border," 1 June 2018 Recent Examples on the Web: Noun Key to that fight is destroying and seizing the costly heavy machinery that’s being used in the operations — most blatantly the diggers and dredges employed in riverside, or alluvial, mining. Jim Wyss And Kyra Gurney, miamiherald, "Dirty gold is the new cocaine in Colombia — and it’s just as bloody," 16 Jan. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'alluvial.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of alluvial


1771, in the meaning defined above


1816, in the meaning defined above

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The first known use of alluvial was in 1771

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Cite this Entry

“Alluvial.” Dictionary, Merriam-Webster, Accessed 25 Oct. 2020.

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How to pronounce alluvial (audio)

English Language Learners Definition of alluvial

geology : made up of or found in the materials that are left by the water of rivers, floods, etc.

More from Merriam-Webster on alluvial

Nglish: Translation of alluvial for Spanish Speakers

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