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1. WordNet® 3.0 (2006)
planetarium
    n 1: a building housing an instrument for projecting the
         positions of the planets onto a domed ceiling
    2: an optical device for projecting images of celestial bodies
       and other astronomical phenomena onto the inner surface of a
       hemispherical dome
    3: an apparatus or model for representing the solar systems
2. The Collaborative International Dictionary of English v.0.48
Planetarium \Plan`e*ta"ri*um\, n. [NL.: cf. F. plan['e]taire.
   See Planetary.]
   An orrery. See Orrery.
   [1913 Webster]
Thesaurus Results for planetarium:

1. Moby Thesaurus II by Grady Ward, 1.0
Cassegrainian telescope, Newtonian telescope, OAO, OSO, astronomical observatory, astronomical telescope, coelostat, coronagraph, coronograph, heliostat, observatory, orrery, radar telescope, radio observatory, radio telescope, reflector, refractor, spectrograph, spectroheliograph, spectrohelioscope, spectroscope, telescope
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