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English definition of “dwarf planet”

dwarf planet

noun [C] uk   us  
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 from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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