Planetarium definition: an apparatus or model representing the planetary system. See examples of PLANETARIUM used in a sentence.
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nounAn astronomical machine which, by the movement of its parts, represents the motions and orbits of the planets. Seeorrery. from the GNU version of the Collaborative International Dictionary of English. nounAn orrery. Seeorrery. fromWiktionary, Creative Commons Attribution/Share-Alike License. ...
Examples from the Corpusplanetarium• But 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....