SILT

I. noun Etymology: Middle English cylte, probably of Scandinavian origin; akin to Norwegian dialect sylt beach flooded at high tide; akin to Old High German sulza salt marsh, Old English sealt salt Date: 15th century loose sedimentary material with rock particles usually 1/20 millimeter or less in diameter, a deposit of sediment (as by a river), ~y adjective II. verb Date: 1799 intransitive verb to become choked or obstructed with ~, transitive verb to choke, fill, cover, or obstruct with ~ or mud , ~ation noun