Hypertext Webster Gateway: "alluvium"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Alluvium \Al*lu"vi*um\, n.; pl. E. {Alluviums}, L. {Alluvia}.
[L., neut. of alluvius. See {Alluvious}.] (Geol.)
Deposits of earth, sand, gravel, and other transported
matter, made by rivers, floods, or other causes, upon land
not permanently submerged beneath the waters of lakes or
seas. --Lyell.
From WordNet (r) 1.7 (wn)
alluvium
n : clay or slit or gravel carried by rushing streams and
deposited where the stream slows down [syn: {alluvial
sediment}, {alluvial deposit}, {alluvion}]
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