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- DictionaryDwarf plan·et/ˈd(w)ôrf ˌplanət/
noun
- 1. a celestial body resembling a small planet but lacking certain technical criteria that are required for it to be classed as such.
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noun
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Planetary-mass object in hydrostatic equilibrium but which has not cleared its neighborhood
A dwarf planet is a small planetary-mass object that is in direct orbit around the Sun, massive enough to be gravitationally rounded, but insufficient to achieve orbital dominance like the eight classical planets of the Solar System. The prototypical dwarf planet is Pluto, which for decades was regarded as a planet before the "dwarf" concept was adopted in 2006. Wikipedia