noun (plural Plutinos)
A small planetlike body orbiting the sun in the region of the Kuiper belt and in resonance with Neptune.
- Pluto and its ensemble of siblings called Plutinos cross Neptune's path around the Sun.
- It's a plutino -- an object that orbits the Sun in the same amount of time as Pluto, but is too small to be called a planet.
1990s: from the name of Pluto (because of a similar orbit) + the Italian diminutive suffix -ino.
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