from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An apparatus or model representing the solar system.
  • n. An optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome.
  • n. A building or room containing a planetarium, with seats for an audience.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A display museum in which images of stars and other astronomical phenomena are projected onto a domed ceiling.
  • n. An orrery.

from the GNU version of the Collaborative International Dictionary of English

  • n. An orrery. See orrery.

from The Century Dictionary and Cyclopedia

  • n. An astronomical machine which, by the movement of its parts, represents the motions and orbits of the planets. See orrery.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

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


from Wiktionary, Creative Commons Attribution/Share-Alike License

From New Latin, formed from planet +‎ -arium.


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  • Now, Hodge reports, the school has added a number of classrooms, an audiovisual room, computer lab, and even a planetarium, which is named for his wife, Marlene, a longtime champion of Project Nino who died in 2004.


  • Of course our planetarium is a fraction of the cost the structure itself is very expensive needless to say the projector. Stories / Popular

  • McCain's "overhead projector" is the apparatus that runs the planetarium, which is a bit like calling the Palomar Observatory a new set of glasses.

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  • There is a fabulous planetarium in the Rose Center for Earth and Space in New York:

    January 23, 2008