Dictionary

planetarium

noun plan·e·tar·i·um \ˌpla-nə-ˈter-ē-əm\

: a building or room in which images of stars, planets, etc., are shown on a high, curved ceiling

plural plan·e·tar·i·ums or plan·e·tar·ia\-ē-ə\

Full Definition of PLANETARIUM

1
:  a model or representation of the solar system
2
a :  an optical device for projecting various celestial images and effects
b :  a building or room housing such a projector
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First Known Use of PLANETARIUM

1734
PLANETARIUMS Defined for Kids

planetarium

noun plan·e·tar·i·um \ˌpla-nə-ˈter-ē-əm\

Definition of PLANETARIUM for Kids

:  a building in which there is a device for projecting the images of heavenly bodies on a ceiling shaped like a dome

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