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:
1990-95

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World English Dictionary
dwarf planet
 
n
any celestial body within the solar system that is larger than a satellite but smaller than a planet, and that orbits the sun

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The new addition, which isn't yet named, brings the dwarf planet's number of known satellites to four.
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