Smut (?), n. [Akin to Sw. smuts, Dan. smuds, MHG. smuz, G. schmutz, D. smet a spot or stain, smoddig, smodsig, smodderig, dirty, smodderen to smut; and probably to E. smite. See Smite, v. t., and cf. Smitt, Smutch.]
1.
Foul matter, like soot or coal dust; also, a spot or soil made by such matter.
2. Mining
Bad, soft coal, containing much earthy matter, found in the immediate locality of faults.
3. Bot.
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.
© Webster 1913.
Smut (?), v. t. [imp. & p. p. Smutted; p. pr. & vb. n. Smutting.]
1.
To stain or mark with smut; to blacken with coal, soot, or other dirty substance.
2.
To taint with mildew, as grain.
Bacon.
3.
To blacken; to sully or taint; to tarnish.
4.
To clear of smut; as, to smut grain for the mill.
© Webster 1913.
Smut, v. i.
1.
To gather smut; to be converted into smut; to become smutted.
Mortimer.
2.
To give off smut; to crock.
© Webster 1913.