noun, plural planetariums, planetaria [plan-i-tair-ee-uh] .
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.

1765–75; < Neo-Latin, noun use of neuter of Latin planētārius planetary; cf. -arium Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To planetaria
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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Word Origin & History

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
Cite This Source
Copyright © 2014, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature