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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
Shortly after the escaping ship disappeared from the screens, we monitored activities from the inside of the planetoid.
A NASA funded team today announced the discovery of a planetoid located a mere 8 billion miles from Earth.
The Hawks discovered four gigantic, artificially created hollows on the surface of the planetoid, each many hundred meters in diameter.
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.
Our techs believe that these hollows are exhausts of a planetoid propulsion system.
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.

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