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From Longman Dictionary of Contemporary English
Related topics: Astronomy
planetariumplan‧e‧tar‧i‧um /ˌplænəˈteəriəm $ -ˈter-/ noun [countable]  HAa building where lights on a curved ceiling show the movements of planets and stars
Examples from the Corpus
planetariumBut take them to a planetarium or a science show and watch their little eyes light up.A mobile, inflatable planetarium costing £9,000 will now be used in the region by up to 10,000 pupils each year.It was only incidentally a timepiece. primarily it was a mechanical representation of the universe, a kind of planetarium.Or sit in a tiny planetarium for an introduction to the rudiments of stellar navigation.I shall never never never forget your back yard, planetarium and ham radio shed.
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