Alluvial-fan definition

ə-lo͝ovē-əl
A fan-shaped accumulation of alluvium deposited at the mouth of a ravine or at the juncture of a tributary stream with the main stream.
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A gradually sloping mass of alluvium that widens out like a fan from the place where a stream begins to slow down.
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A fan-shaped mass of sediment, especially silt, sand, gravel, and boulders, deposited by a river when its flow is suddenly slowed. Alluvial fans typically form where a river pours out from a steep valley through mountains onto a flat plain. Unlike deltas, they are not deposited into a body of standing water.
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A cone-shaped heap of alluvium deposited by a river.
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Other Word Forms

Noun

Singular:
alluvial-fan
Plural:
alluvial-fans