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
Oahu’s Bishop Museum has a planetarium specifically set up to teach celestial navigation.
—
Literary Hub, 21 Oct. 2025
And Blazy’s childhood planetarium.
—Nathan Heller, Vogue, 14 Oct. 2025
For the most accurate location-specific information, consult online planetariums like Stellarium.
—Jamie Carter, Forbes.com, 15 Sep. 2025
Those who vacation here can explore the preserve at Bird Island and visit the planetarium.
—Brandee Gruener, Southern Living, 9 Sep. 2025
See All Example Sentences for planetarium
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Literary Hub, 21 Oct. 2025
And Blazy’s childhood planetarium.
—Nathan Heller, Vogue, 14 Oct. 2025
For the most accurate location-specific information, consult online planetariums like Stellarium.
—Jamie Carter, Forbes.com, 15 Sep. 2025
Those who vacation here can explore the preserve at Bird Island and visit the planetarium.
—Brandee Gruener, Southern Living, 9 Sep. 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 3 Nov. 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
Love words? Need even more definitions?
Merriam-Webster unabridged
Share