SILT

noun

1. Mud or fine earth deposited from running or standing water.
2. (by extension) Material with similar physical characteristics, whatever its origins or transport.
3. A particle from 3.9 to 62.5 microns in diameter, following the Wentworth scale.

verb

1. To clog or fill with silt.
2. To become clogged with silt.
3. To flow through crevices; to percolate.