planetarium
noun
- theatre for displaying astronomical objects
Wiktionary
Pronunciation: /plænɪˈtɛəɹɪəm/ / /plænɪˈtɛːɹi.əm/ / /plænɪˈtɛɚiəm/
noun
Etymology: Borrowed from New Latin planētārium. Equivalent to planet + -arium.
- A display museum in which images of stars and other astronomical phenomena are projected onto a domed ceiling.
- An orrery.