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n. pl. plu·ti·nos
A trans-Neptunian Kuiper belt object that orbits the Sun in the same time period as Pluto, making exactly two orbits for every three orbits of Neptune.

[Plut(o) + -ino, diminutive suff. (as in neutrino).]
References in periodicals archive ?
According to now-outdated wisdom about the formation of the Solar System, there should be nothing this big this far beyond the plutinos.
This includes a group of four dubbed Plutinos because, like Pluto, their orbit has a special synchrony with that of Neptune.
These icy bodies belong to a group of Kuiper-belt residents called Plutinos because like Pluto, they make two orbits about the sun in the time that Neptune makes three.