A sedimentary material consisting of very fine particles intermediate in size between sand and clay.
To become filled with silt: an old channel that silted up.
To fill, cover, or obstruct with silt: River sediments gradually silted the harbor.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.