[n] any fungus of the order Ustilaginales
[n] destructive diseases of plants (especially cereal grasses) caused by fungi that produce black powdery masses of spores
[n] a black colloidal substance consisting wholly or principally of amorphous carbon and used to make pigments and ink
[v] affect with smut or mildew, as of a crop such as corn
[v] become affected with smut, as of corn
[v] stain with a dirty substance, such as soot