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English definition of “dwarf planet”

dwarf planet

noun [C]    
a round mass of metal and rock or gas , moving around the Sun or another star , that is not large enough to be considered a planet . Dwarf planets in the solar system include Ceres, Pluto , and Eris.
(Definition of dwarf planet noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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