planetarium - WordReference.com Dictionary of English

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- See Also:
- - planche
  - planchet
  - planchette
  - Planck's constant
  - plane
  - plane polarization
  - plane table
  - planer
  - planet
  - planet gear
  - planetarium
  - planetary gear
  - planetary nebula
  - planetesimal
  - planetoid
  - planform
  - plangent
  - planigale
  - planimeter
  - planish
  - planisphere
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planetarium

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Concise Oxford English Dictionary © 2008 Oxford University Press:
planetarium /ˌplanɪˈtɛːrɪəm/

▶noun (pl. planetariums or planetaria /-rɪə/)

1 a domed building in which images of stars and planets are projected for public entertainment or education.

2 another term for orrery.

– origin C18: mod. L., from L. planetarius ‘relating to the planets’.

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