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.
... the institution of marriage and its relation to society and morality.
The novel intially appeared serially in the periodical Ruskii Vestnik ("Russian Messenger"), but ...