Webster's English Dictionary

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sediment

sed.i.ment \'sed-*-m*nt\ \-.ment\ n [MF, fr. L sedimentum settling, fr. 
   sede-re to sit, sink down] 1: the matter that settles to the bottom of a 
   liquid : DREGS  2: material deposited by water, wind, or glaciers  - 
   sed.i.ment vb