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Noun planetarium has 3 senses
  1. planetarium - a building housing an instrument for projecting the positions of the planets onto a domed ceiling
    --1 is a kind of
    building, edifice
    --1 has part: planetarium
  2. planetarium - an optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome
    --2 is a kind of
    optical device
    --2 is a part of planetarium
  3. planetarium - an apparatus or model for representing the solar systems
    --3 is a kind of
    model, simulation
    --3 has particulars: orrery
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