niggerhead

noun8

1. •
   (vulgar, offensive) A term of abuse for a black person.
2. •
   (offensive) A coral or stone outcrop that stands above the surface of the water.

   • Landward is the almost unbroken wall of submerged reefs where the big niggerhead corals send their solid bulks up to within a fathom or two of the surface. — 1989
3. •
   (offensive, old-fashioned) A tussock (clump of plant material), found on the tundra.

   • These plants fill the interstices between the grasses and tiny shrubs that make the outer, fuller form of the niggerhead. — 1912
4. •
   (offensive) A coneflower.
5. •
   (offensive, old-fashioned) A bollard made from an old cannon.
6. •
   (no longer used) A strong black variety of chewing tobacco, usually in twisted plug form.
7. •
   (offensive, no longer used) A geode.
8. •
   (offensive, no longer used) A stone, piece of gangue, or lump of coal that is of a grade with a certain size.