dwarf planet
noun
a spherical celestial body revolving about the sun, similar to a planet but not large enough to gravitationally clear its orbital region of most or all other celestial bodies. Pluto is a dwarf planet.
Origin of dwarf planet
First recorded in 1990–95
Words nearby dwarf planet
British Dictionary definitions for dwarf planet
dwarf planet
noun
any celestial body within the solar system that is larger than a satellite but smaller than a planet, and that orbits the sun