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planetarium

[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)
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 of planetarium
1765-1775
1765-75; < New Latin, noun use of neuter of Latin planētārius planetary; cf. -arium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for planetarium

planetarium

/ˌplænɪˈtɛərɪəm/
noun (pl) -iums, -ia (-ɪə)
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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for planetarium
n.

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.

Online Etymology Dictionary, © 2010 Douglas Harper
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15
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