interstellar planet

Etymology
Constructed from :. The latter derives from, from , from , , from variant of , from , of unknown origin. Perhaps from a, cognate with 🇨🇬, 🇨🇬, 🇨🇬. More at.

Noun

 * 1)  a planetary-mass object which has either been ejected from its system or was never gravitationally bound to any star or other such object, and that therefore orbits the galaxy directly.