Definition of: smut

(smut) noun
1. The blackening made by soot, smoke, etc.
2. Obscenity; obscene language.
3. Any of various fungus diseases of plants, in which the affected parts change into a dusty black powder.
4. The parasitic fungus (order Ustiliginales) causing such a disease.
—v. smut·ted, smut·ting v.t.
1. To blacken or stain, as with soot or smoke.
2. To affect with smut, as growing grain.
3. To remove the smut from (grain).
4. Figuratively, to pollute; defame.
—v.i.
5. To give off smut.
6. To be or become stained.
7. To be affected with smut, as growing grain. [<LG schmutt dirt]