资料来源 : Webster's Revised Unabridged Dictionary (1913)

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.