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allude
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alluvial fan
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alluvial fan

alluvial fan (plural alluvial fans)


noun 
Definition:
 
1. fan-shaped area deposited by slowed river: a fan-shaped area of alluvium deposited by a river when reaching flatter land

2. fan-shaped deposit of sediments: a fan-shaped deposit of sediment formed at the point where a stream enters a valley or plain or another, larger stream

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