planetarium
pla·ne·ta·rium
noun
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
Origin
Borrowed from New Latin planētārium. Equivalent to planet + -arium.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.