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Alluvial definition, of or relating to alluvium. See more. Definition of Alluvial. 1. soil composed of alluvium [n -S] Medical Definition of Alluvial. 1. Relating to something in streams and rivers or created/deposited by stream action. Describes materials deposited by running water. (09 Oct 1997) Lexicographical Neighbors of Alluvial DEFINITION or ALLUVIAL FANS Blair and mcPherson (1994) define alluvial fans as "semiconical accu- mulations of coarse-grained and angular sediment deposited where the feeder channel of an upland... Feb 28, 2018 · In Earth science, by definition, an alluvial fan is a fan-shaped deposit that gets formed when a stream of water flowing rapidly down a steep gradient enters an area having a gentle slope, slows down, flattens, and spreads out depositing gravel, sand, and smaller pieces of sediment, such as silt―together known as alluvium―in that area.