dirt

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Earth or soil.
2. n. A filthy or soiling substance, such as mud or dust.
3. n. Excrement.
4. n. A squalid or filthy condition.
5. n. One that is mean, contemptible, or vile.
6. n. Obscene language or subject matter.
7. n. Malicious or scandalous gossip.
8. n. Information that embarrasses or accuses.
9. n. Unethical behavior or practice; corruption.
10. n. Material, such as gravel or slag, from which metal is extracted in mining.

Century Dictionary and Cyclopedia

1. n. Any foul or filthy substance, as excrement, mud, mire, or pitch; whatever, adhering to anything, renders it foul, unclean, or offensive.
2. n. Earth, especially loose earth; disintegrated soil, as in gardens; hence, any detrital or disintegrated material.
3. n. Specifically In placer-mining, the detrital material (usually sand and gravel) from which the gold is separated by washing.
4. n. Meanness; sordidness; baseness.
5. n. Abusive or scurrilous language.
6. Consisting or made of loose earth: as, a dirt road (a road not paved or macadamized).
7. To make foul or filthy; soil; befoul; dirty.

Wiktionary

1. n. soil or earth
2. n. A stain or spot (on clothes etc); any foreign substance that worsens appearance
3. n. Previously unknown negative facts (or invented "facts") about a person, gossip
4. v. transitive, rare To make foul or filthy; soil; befoul; dirty

GNU Webster's 1913

1. n. Any foul of filthy substance, as excrement, mud, dust, etc.; whatever, adhering to anything, renders it foul or unclean; earth.
2. n. Meanness; sordidness.
3. n. In placer mining, earth, gravel, etc., before washing.
4. v. To make foul of filthy; to dirty.

WordNet 3.0

1. n. obscene terms for feces
2. adj. (of roads) not leveled or drained; unsuitable for all year travel
3. n. disgraceful gossip about the private lives of other people
4. n. the part of the earth's surface consisting of humus and disintegrated rock
5. n. the state of being covered with unclean things