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/plænɪˈtɛəɹɪəm/ · noun
A display museum in which images of stars and other astronomical phenomena are projected onto a domed ceiling..
Use planetarium when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Planetarium means A display museum in which images of stars and other astronomical phenomena are projected onto a domed ceiling..
Common synonyms include Spacearium.
The opposite depends on the specific sense.
Use planetarium where its definition matches the intended context.
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