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From: Webster's Revised Unabridged Dictionary (1913)

 Di·lu·vi·um n.; pl. E. Diluviums L. Diluvia   Geol. A deposit of superficial loam, sand, gravel, stones, etc., caused by former action of flowing waters, or the melting of glacial ice.
 Note:The accumulation of matter by the ordinary operation of water is termed alluvium.