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WordReference Random House Learner's Dictionary of American English © 2024plan•e•tar•i•um /ˌplænɪˈtɛriəm/USA pronunciation n. [countable], pl. -tar•i•ums, -tar•i•a /-ˈtɛriə/.USA pronunciation - Astronomya model representing the planetary system.
- Astronomya device that produces a representation of the sky, the stars, the planets, etc., by the use of movie projectors.
- Astronomythe building or room in which such a device is housed.
WordReference Random House Unabridged Dictionary of American English © 2024plan•e•tar•i•um (plan′i târ′ē əm),USA pronunciation n., pl. -tar•i•ums, -tar•i•a (-târ′ē ə).USA pronunciation - Astronomyan apparatus or model representing the planetary system.
- Astronomya device that produces a representation of the heavens by the use of a number of moving projectors.
- Astronomythe building or room in which such a device is housed.
- Neo-Latin, noun, nominal use of neuter of Latin planētārius planetary; compare -arium
- 1765–75
Collins Concise English Dictionary © HarperCollins Publishers:: planetarium /ˌplænɪˈtɛərɪəm/ n ( pl -iums, -ia / -ɪə/)- an instrument for simulating the apparent motions of the sun, moon, and planets against a background of stars by projecting images of these bodies onto the inside of a domed ceiling
- a building in which such an instrument is housed
- a model of the solar system, sometimes mechanized to show the relative motions of the planets
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