planetaria

planetarium

[plan-i-tair-ee-uhm]
noun, plural planetariums, planetaria [plan-i-tair-ee-uh] .
1.
an apparatus or model representing the planetary system.
2.
a device that produces a representation of the heavens by the use of a number of moving projectors.
3.
the building or room in which such a device is housed.

Origin:
1765–75; < Neo-Latin, noun use of neuter of Latin planētārius planetary; cf. -arium

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World English Dictionary
planetarium (ˌplænɪˈtɛərɪəm)
 
n , pl -iums, -ia
1.  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
2.  a building in which such an instrument is housed
3.  a model of the solar system, sometimes mechanized to show the relative motions of the planets

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Word Origin & History

planetarium
1734, "orrery," Mod.L., from L.L. planeta (see planet) + L. -arium "a place for." Mod. sense of "device for projecting the night sky onto the interior of a dome" is attested from 1929.
Online Etymology Dictionary, © 2010 Douglas Harper
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