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
Tucson by night All told, Tucson’s Astro Trail features five observatories, a planetarium, a laboratory, an aviation and space museum, two state parks, and one national park.
—
Bailey Berg, AFAR Media, 4 Feb. 2025
Previously, Schaeffer had also donated $500,000 to ETHS for its planetarium, which is named the Leonard D. Schaeffer Theater and Michael Planetarium.
—Richard Requena, Chicago Tribune, 23 Jan. 2025
Guests are invited to view the cosmos using telescopes provided by the planetarium.
—Joe Rassel, Orlando Sentinel, 9 Jan. 2025
The Franklin Institute, a science museum with a planetarium, is 10 minutes away on foot, as are a Giant supermarket and a Trader Joe’s.
—Angela Serratore, New York Times, 15 Jan. 2025
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Bailey Berg, AFAR Media, 4 Feb. 2025
Previously, Schaeffer had also donated $500,000 to ETHS for its planetarium, which is named the Leonard D. Schaeffer Theater and Michael Planetarium.
—Richard Requena, Chicago Tribune, 23 Jan. 2025
Guests are invited to view the cosmos using telescopes provided by the planetarium.
—Joe Rassel, Orlando Sentinel, 9 Jan. 2025
The Franklin Institute, a science museum with a planetarium, is 10 minutes away on foot, as are a Giant supermarket and a Trader Joe’s.
—Angela Serratore, New York Times, 15 Jan. 2025
See all Example Sentences for planetarium
Dictionary Entries Near planetarium
Cite this Entry
“Planetarium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/planetarium. Accessed 11 Feb. 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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