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What is a planetoid?

What is a planetoid? Here are some definitions.

Noun
  1. (astronomy) An asteroid of any size
  2. (astronomy) An asteroid-like body in an orbit beyond the asteroid belt, such as a centaur or Kuiper belt object
  3. (astronomy) A larger, planetary, body in orbit around the Sun, such as Vesta or (candidate) dwarf planets such Eris or Sedna
  4. (astronomy) A dwarf planet
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Examples
Mario will find himself travelling halfway across the nearest planetoid in seconds.
It orbits the sun on a highly elliptical path which, even at its perihelion, puts the planetoid more than twice the average distance from the Sun to Pluto.
A NASA funded team today announced the discovery of a planetoid located a mere 8 billion miles from Earth.
Sedna, the planetoid 1,000 miles in diameter discovered several weeks ago, was first photographed with a small moon orbiting its icy sphere.
The planetoid, believed to be half rock and half ice, is named after the Inuit goddess said to have created the sea creatures of the Arctic.
I've heard a good astronomical theory that the moon was created by a planetoid crashing into the earth a long time ago, possibly carrying with it the seeds for life itself.

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