noun
planetarium
pla-nih-TEH-uh-reerm
noun
1
A building or theatre with a domed ceiling used to project images of stars, planets, and other astronomical scenes for viewers below.
"The class took a field trip to the planetarium to see a show about black holes."
"The city's planetarium projects a full night sky onto its dome."
How to Use Planetarium
Learner’s notesIn plain EnglishA dome-shaped theatre that projects the night sky for an audience.
Common pairings
visit the planetarium
planetarium show
planetarium dome
Word Forms
planetariums plural, planetaria plural
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The class took a field trip to the _____ to see a show about black holes.
Etymology
Formed from planet plus the Latin ending -arium (a place for something), on the model of words like aquarium.