Noun
a planet with a moon large enough to be considered a planet, were the planet not there, having a substantial portion of the system's overall mass.
a pair of planemos in orbit around each other, where the barycenter of their orbits lies outside of both planemos, which in turn is in orbit about a star.
a pair of planemos in orbit around each other, where the barycenter of their orbits lies outside of both planemos.
a planemo with a moon large enough to be considered a planemo, having a substantial portion of the system's overall mass.
Source: en.wiktionary.org