n. & v.
--n. sediment deposited by water in a channel, harbour, etc.
--v.tr. & intr. (often foll. by up) choke or be choked with silt.
Derivatives:
siltation n. silty adj.
Etymology: ME, perh. rel. to Da., Norw. sylt, OLG sulta, OHG sulza salt marsh, formed as SALT