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

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

First Known Use of PLANETARIUM



Next Word in the Dictionary: planetaryPrevious Word in the Dictionary: planetarilyAll Words Near: planetarium
May 28, 2015
fictioneer Hear it
someone who writes fiction
Take a 3-minute break and test your skills!
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears