soil particles with a grain size between 0.004 mm and 0.062 mm (coarser than clay particles but finer than sand) (contrast with clay and sand).

Merriam-Webster Online Dictionary
silt (noun)
loose sedimentary material with rock particles usually millimeter or less in diameter - 1/20 , also soil containing 80 percent or more of such silt and less than 12 percent of clay
a deposit of sediment (as by a river)
silt (verb)
intransitive verb
transitive verb
to become choked or obstructed with silt - often used with up the channel silted up to choke, fill, cover, or obstruct with silt or mud
silt (Wikipedia)

Silt is granular material of a size between sand and clay, whose mineral origin is quartz and feldspar. Silt may occur as a soil (often mixed with sand or clay) or as sediment mixed in suspension with water (also known as a suspended load) and soil in a body of water such as a river. It may also exist as soil deposited at the bottom of a water body, like mudflows from landslides. Silt has a moderate specific area with a typically non-sticky, plastic feel. Silt usually has a floury feel when dry, and a slippery feel when wet. Silt can be visually observed with a hand lens, exhibiting a sparkly appearance. It also can be felt by the tongue as granular when placed on the front teeth (even when mixed with clay particles).

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