Definition of Plutino in US English:


nounPlural Plutinos

  • A small planet-like 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 they have a similar orbit) + the Italian diminutive suffix -ino.