A
plutino is a
Pluto-like object, insofar as it has the same relative
orbit as Pluto. These orbits are stabilized by an
orbital resonance with
Neptune, similar to Pluto's 3:2 orbital resonance. Plutinos form the inner part of the
Kuiper belt.
See hawaii.edu on Plutinos (http://www.ifa.hawaii.edu/faculty/jewitt/kb/plutino.html)