Webster's English Dictionary

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silt

1. silt \'silt\ \'sil-te-\ n [ME cylte, prob. of Scand origin; akin to Dan 
   sylt salt marsh; akin] to OHG sulza salt marsh, OE sealt salt 1: loose 
   sedimentary material with rock particles usu. 1/20 mil limeter or less in 
   diameter; also : soil containing 80 percent or more of such silt and less 
   than 12 percent of clay 2: a deposit of sediment (as by a river)  - silty 
   aj
2. silt \sil-'ta--sh*n\ vi : to become choked or obstructed with silt to 
   choke, cover, or obstruct w ith silt or mud - silt.ation n