smut

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A particle of dirt or soot.
• noun A smudge made by soot, smoke, or dirt.
• noun Sexually explicit or prurient language or material, such as books or movies.
• noun Any of various plant diseases, especially of cereal grasses, caused by parasitic fungi chiefly of the class Ustilaginomycetes that form black powdery masses of spores on the affected parts.
• noun A fungus causing such a disease.
• intransitive verb To blacken or smudge, as with smoke or grime.
• intransitive verb To affect (a plant) with smut.
• intransitive verb To be or become blackened or smudged.

from The Century Dictionary.

• In leather manufacturing, to go over (the blacked side of a hide or skin) with a woolen cloth to remove dirt and improve the appearance of the blacking.
• To stain or mark with smut; blacken with coal, soot, or other dirty substance.
• To affect with the disease called smut; mildew.
• Figuratively, to tarnish; defile; make impure; blacken.
• To make obscene.
• To gather smut; be converted into smut.
• To give off smut; crock.
• noun A spot made with soot, coal, or the like; also, the fouling matter itself.
• noun Obscene or filthy language.
• noun A fungous disease of plants, affecting especially the cereal plants, to many of which it is exceedingly destructive.
• noun Earthy, worthless coal, such as is often found at the outcrop of a seam. In Pennsylvania also called black-dirt, blossom, and crop.

from the GNU version of the Collaborative International Dictionary of English.

• intransitive verb To gather smut; to be converted into smut; to become smutted.
• intransitive verb To give off smut; to crock.
• transitive verb To stain or mark with smut; to blacken with coal, soot, or other dirty substance.
• transitive verb To taint with mildew, as grain.
• transitive verb To blacken; to sully or taint; to tarnish.
• transitive verb To clear of smut.
• noun Foul matter, like soot or coal dust; also, a spot or soil made by such matter.
• noun (Mining) Bad, soft coal, containing much earthy matter, found in the immediate locality of faults.
• noun (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.
• noun Obscene language; ribaldry; obscenity.
• noun a machine for cleansing grain from smut.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun uncountable Soot.
• noun uncountable Sexually vulgar material; something that is sexual in a dirty way; pornographic material.
• noun derogatory A promiscuous, classless woman.
• noun Any of a range of fungi, mostly Ustilaginomycetes, that cause plant disease in grasses, including cereal crops; the disease so caused.
• verb To stain (or be stained) with soot etc.
• verb intransitive To gather smut; to be converted into smut; to become smutted.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an offensive or indecent word or phrase
• noun any fungus of the order Ustilaginales
• noun creative activity (writing or pictures or films etc.) of no literary or artistic value other than to stimulate sexual desire
• noun a black colloidal substance consisting wholly or principally of amorphous carbon and used to make pigments and ink
• verb become affected with smut
• verb affect with smut or mildew, as of a crop such as corn
• noun destructive diseases of plants (especially cereal grasses) caused by fungi that produce black powdery masses of spores
• verb make obscene
• verb stain with a dirty substance, such as soot