n. A sedimentary material consisting of very fine particles intermediate in size between sand and clay. v. silt·ed, silt·ing, silts v.intr. To become filled with silt: an old channel that silted up. v.tr. To fill, cover, or obstruct with silt: River sediments gradually silted the harbor. [Middle English sylt, probably of Scandinavian origin; see sal- in the Appendix of Indo-European roots.] silt·ation n. silty adj. |
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