From WordNet (r) 3.0 (2006):
soil
n 1: the state of being covered with unclean things [syn:
dirt, filth, grime, soil, stain, grease,
grunge]
2: the part of the earth's surface consisting of humus and
disintegrated rock [syn: soil, dirt]
3: material in the top layer of the surface of the earth in
which plants can grow (especially with reference to its
quality or use); "the land had never been plowed"; "good
agricultural soil" [syn: land, ground, soil]
4: the geographical area under the jurisdiction of a sovereign
state; "American troops were stationed on Japanese soil"
[syn: territory, soil]
v 1: make soiled, filthy, or dirty; "don't soil your clothes
when you play outside!" [syn: dirty, soil, begrime,
grime, colly, bemire] [ant: clean, make clean]