noun
- a small celestial body resembling a planet, especially an asteroid
Usage: astronomy
Examples
- The spacecraft detected several planetoids in the asteroid belt.
- Ceres is the largest planetoid between Mars and Jupiter.
- Scientists study planetoids to learn about the early solar system.
- The planetoid’s irregular orbit made it difficult to track.
- Many planetoids are too small to be seen without a telescope.
- The collision created debris from the shattered planetoid.