niggerhead

Meanings

1. A bollard made from an old cannon.
2. A geode.
3. A coneflower.
4. A coral or stone outcrop that stands above the surface of the water.
5. A tussock (clump of plant material), found on the tundra.
6. A strong black variety of chewing tobacco, usually in twisted plug form.
7. A stone, piece of gangue, or lump of coal that is of a grade with a certain size.
8. A term of abuse for a black person.

Etymology

From nigger + head, reflecting a supposed resemblance to a black person's head.