The Collaborative International Dictionary of English v.0.48:

Silt \Silt\ (s[i^]lt), n. [OE. silte gravel, fr. silen to drain,
   E. sile; probably of Scand. origin; cf. Sw. sila, prob. akin
   to AS. se['o]n to filter, s[imac]gan to fall, sink, cause to
   sink, G. seihen to strain, to filter, OHG. s[imac]han, Icel.
   s[imac]a, Skr. sic to pour; cf. Gr. 'ikma`s moisture. Cf.
   Sig, Sile.]
   Mud or fine earth deposited from running or standing water.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Silt \Silt\, v. t. [imp. & p. p. Silted; p. pr. & vb. n.
   Silting.]
   To choke, fill, or obstruct with silt or mud.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Silt \Silt\, v. i.
   To flow through crevices; to percolate.
   [1913 Webster]

WordNet (r) 3.0 (2006):

silt
    n 1: mud or clay or small rocks deposited by a river or lake
    v 1: become chocked with silt; "The river silted up" [syn: silt
         up, silt]

Moby Thesaurus II by Grady Ward, 1.0:

37 Moby Thesaurus words for "silt":
   alluvion, alluvium, ash, cinder, clinker, debris, deposit,
   deposition, deposits, detritus, diluvium, draff, dregs, drift,
   dross, ember, feces, froth, grounds, lees, loess, moraine, offscum,
   ooze, precipitate, precipitation, scoria, scree, scum, sediment,
   settlings, sinter, slag, sludge, smut, soot, sublimate



U.S. Gazetteer Places (2000):

Silt, CO -- U.S. town in Colorado
   Population (2000):    1740
   Housing Units (2000): 668
   Land area (2000):     2.821723 sq. miles (7.308230 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    2.821723 sq. miles (7.308230 sq. km)
   FIPS code:            70195
   Located within:       Colorado (CO), FIPS 08
   Location:             39.546316 N, 107.652072 W
   ZIP Codes (1990):     81652
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Silt, CO
    Silt