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Definitions of planetarium:
  • noun:   an apparatus or model for representing the solar systems
  • noun:   an optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome
  • noun:   a building housing an instrument for projecting the positions of the planets onto a domed ceiling

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Book See planetarium used in context: 2 rhymes, several books and articles.

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