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[plan-i-tair-ee-uh m] /ˌplæn ɪˈtɛər i əm/

noun, plural planetariums, planetaria
[plan-i-tair-ee-uh] /ˌplæn ɪˈtɛər i ə/ (Show IPA)
an apparatus or model representing the planetary system.
a device that produces a representation of the heavens by the use of a number of moving projectors.
the building or room in which such a device is housed.
noun (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

1734, “orrery,” Modern Latin, from Late Latin planeta (see planet) + Latin -arium “a place for.” Sense of “device for projecting the night sky onto the interior of a dome” is attested from 1929.


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