Webster's English Dictionary

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alluvium

al.lu.vi.um \*-'lu:-ve--*m\ \-ve--*\ n or alluviums or al.lu.via [LL, neut. 
   of alluvius alluvial, fr. L alluere] pl  : clay, silt, sand, gravel, or 
   similar detrital material deposited by runn ing water