diluvium

Di*lu"vi*um, n.; pl. E. Diluviums, L. Diluvia. Etym: [L. diluvium. See Dilute, Deluge.] (Geol.) Defn: 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.

---