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 The terroir was basked in sunlight while regional soils form a unique combination of alluvial and marine sediments. Tom Mullen, Forbes, 6 Sep. 2021 Geologists have said that construction narrowed the river bed and the surrounding alluvial flood plain of the Ezine stream in Kastamonu’s Bozkurt district, where the damage was most severe, from 400 meters (1,312 feet) to 15 meters (49 feet). NBC News, 14 Aug. 2021 Seawalls along the alluvial valleys can negate the natural benefits these low-lying areas confer to unprotected sections. Robin Meadows, Scientific American, 11 Aug. 2021 Certain stretches of coastlines naturally take up seawater better than others—alluvial valleys, for example, the floodplains where rivers meet the sea. Matt Simon, Wired, 14 July 2021 The spring 2020 data comes from 555 water wells measured in the alluvial aquifer, which stretches from Ashley County in southeast Arkansas to Clay County in northeast Arkansas, and 202 measurements from the Sparta/Memphis aquifer. Ashton Eley, Arkansas Online, 21 June 2021 An unpublished analysis of satellite images by Sam Brooke of UCSB has identified about 100 abrupt river jumps in the past 50 years: about 40 on coastal deltas and 60 on inland alluvial fans where rivers exit mountain valleys. Fred Pearce, Science | AAAS, 13 May 2021 Built atop rich alluvial Ganges soil, the town is particularly suited to cultivating jasmine, vetiver, and Damask rose, which owes its name to Damascus but is native to central Asia. Travel, 4 Jan. 2021 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, 11 May 2020 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, 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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alluvial cone

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Last Updated

18 Sep 2021

Cite this Entry

“Alluvial.” Dictionary, Merriam-Webster, Accessed 16 Oct. 2021.

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English Language Learners Definition of alluvial

: 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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