planetarium
noun
plan·e·tar·i·um
ˌpla-nə-ˈter-ē-əm 
plural planetariums or planetaria
ˌpla-nə-ˈter-ē-ə
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
Examples of planetarium in a Sentence
Recent Examples on the Web
Download the virtual planetarium stargazing app Star Walk to help locate it.
—
Skyler Caruso, People.com, 8 Apr. 2025
This is one of the few institutions worldwide to have both an aquarium and a planetarium in one museum.
—Alesa Andrew, Parents, 27 Mar. 2025
For the most accurate location-specific information, consult online planetariums like Stellarium.
—Jamie Carter, Forbes.com, 4 Apr. 2025
The opera features live singers and music, an electroacoustic score with surround-sound enhancement, and is accompanied by the planetarium’s wow-worthy HD images of space.
—Randy McMullen, The Mercury News, 20 Mar. 2025
See All Example Sentences for planetarium
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Skyler Caruso, People.com, 8 Apr. 2025
This is one of the few institutions worldwide to have both an aquarium and a planetarium in one museum.
—Alesa Andrew, Parents, 27 Mar. 2025
For the most accurate location-specific information, consult online planetariums like Stellarium.
—Jamie Carter, Forbes.com, 4 Apr. 2025
The opera features live singers and music, an electroacoustic score with surround-sound enhancement, and is accompanied by the planetarium’s wow-worthy HD images of space.
—Randy McMullen, The Mercury News, 20 Mar. 2025
See All Example Sentences for planetarium
Cite this Entry
“Planetarium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/planetarium. Accessed 22 Apr. 2025.
Copy CitationKids Definition
planetarium
noun
plan·e·tar·i·um
ˌplan-ə-ˈter-ē-əm
plural planetariums or planetaria
-ē-ə
1
: a device that projects images of heavenly bodies on a ceiling shaped like a dome
2
: a building or room housing a planetarium
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