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Definition of planetarium noun from the Oxford Advanced Learner's Dictionary

planetarium

noun
 
/ˌplænɪˈteəriəm/
 
/ˌplænɪˈteriəm/
(plural planetariums)
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  1. a building with a curved ceiling to represent the sky at night, with moving images of the planets and stars, used to educate and entertain peopleTopics Buildingsc2
    Word Originmid 18th cent.: modern Latin, from Latin planetarius ‘relating to the planets’.
See planetarium in the Oxford Advanced American Dictionary
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trait
noun
 
 
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