Definition of planetarium in English:


Syllabification: plan·e·tar·i·um
Pronunciation: /ˌplaniˈte(ə)rēəm

noun (plural planetariums or planetaria /-ˈte(ə)rēə/)

  • 1A building in which images of stars, planets, and constellations are projected on the inner surface of a dome for public entertainment or education.
    More example sentences
    • He announced to his wife that he was going to educate the public by building a planetarium in the back room of their house.
    • Although not terribly well known, the Observatorio Astronomico de Mallorca has a working planetarium and offers public skywatching using telescopes sufficiently powerful to study Jupiter, Mars, Saturn, Venus and Mercury.
    • Cosmic Microwave Background: The New Cosmology and other elements of the AstroBulletin are made available to museums, science centers, planetariums, and other public spaces nationwide and around the world.
  • 1.1A device used to project images of stars, planets, and constellations.
    More example sentences
    • While astronomers were radically expanding their view of the universe in the early part of the twentieth century, a new invention was also fueling a rising public enthusiasm: the planetarium.
    • A planetarium can do stars and project slides on the ceiling, maybe make a laser dance in one place, and that's about it.
    • The planetarium projects bright stars and constellations visible in the Southern Hemisphere on your walls and ceilings.
  • 2 another term for orrery.
    More example sentences
    • He wrote Theorica Planetarum which describes the construction of a planetarium, the first to be described by a European.
    • He also included instructions on building a planetarium as well as its geometrical description.


mid 18th century: modern Latin, from Latin planetarius 'relating to the planets'.

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