smut

smut is a Noun

Definition:

[1] Foul matter, like soot or coal dust; also, a spot or soil made by such matter.

[2] Bad, soft coal, containing much earthy matter, found in the immediate locality of faults.

[3] An affection of cereal grains producing a swelling which is at length resolved into a powdery sooty mass. It is caused by parasitic fungi of the genus Ustilago. Ustilago segetum, or U. Carbo, is the commonest kind; that of Indian corn is Ustilago maydis.

[4] Obscene language; ribaldry; obscenity. He does not stand upon decency . . . but will talk smut, though a priest and his mother be in the room. Addison. Smut mill, a machine for cleansing grain from smut.