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dwarf planet (plural dwarf planets)

  1. (astronomy) Any astronomical body which has achieved hydrostatic equilibrium (which is the shape a body of water would take, as opposed to a small Solar System body), orbits the Sun (as opposed to a moon), and has not “cleared its neighbourhood” of competing bodies (as opposed to a planet).
    Synonyms: planetoid, quasi-planet, sub-planet
    Hypernyms: minor planet, planet, planetary-mass object
    Hyponyms: ice dwarf, plutoid

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