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



BrE BrE//ˌplænɪˈteəriəm//
; NAmE NAmE//ˌplænɪˈteriəm//
(pl. planetariums) Buildings, The universe
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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 people See related entries: Buildings, The universe Word Originmid 18th cent.: modern Latin, from Latin planetarius ‘relating to the planets’.
See the Oxford Advanced American Dictionary entry: planetarium