A sedimentary material consisting of very fine particles intermediate in size between sand and clay.
v. silt·ed, silt·ing, silts
To become filled with silt: an old channel that silted up.
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.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The American Heritage Dictionary Blog
Check out our blog, updated regularly, for new words and revised definitions, interesting images from the 5th edition, discussions of usage, and more.