silt

This term describes the fine-grained mineral matter that settles out of water, creating a soft, muddy layer. It carries a connotation of gradual accumulation and natural deposition, often associated with riverbeds, deltas, and coastal estuaries. As a noun, it is treated as an uncountable mass noun. It refers to the material itself rather than individual particles, meaning it does not have a plural form in standard usage and requires partitive phrases like "a layer of silt" or "deposits of silt" to specify quantity.