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Meaning of planetarium

plan•e•tar•i•um

Pronunciation: (plan"i-târ'ē-um), [key]
— pl. -tar•i•ums, -tar•i•a
  1. an apparatus or model representing the planetary system.
  2. a device that produces a representation of the heavens by the use of a number of moving projectors.
  3. the building or room in which such a device is housed.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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