Definition of planetarium
English to English noun - a building housing an instrument for projecting the positions of the planets onto a domed ceiling
source: WordNet 3.0 - an optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome
source: WordNet 3.0 - an apparatus or model for representing the solar systems
source: WordNet 3.0 - An orrery. See Orrery.
source: Webster 1913
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