plu·ti·no  (plōō-tē'nō)  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. [Pluto + -ino, diminutive suff. (as in neutrino).] |
plutino (pl -tē'nō) Pronunciation Key
A Kuiper belt object that orbits the Sun in the same time period as Pluto or that orbits the Sun twice for every three orbits that Neptune makes. Too small to be considered planets, plutinos make up approximately one fourth of the Kuiper Belt objects. |