planetarium

play
noun plan·e·tar·i·um \ˌpla-nə-ˈter-ē-əm\

Definition of planetarium

plural

planetariums

or

planetaria

play \ˌpla-nə-ˈter-ē-ə\
  1. 1 :  a model or representation of the solar system

  2. 2a :  an optical device for projecting various celestial images and effectsb :  a building or room housing such a projector

Recent Examples of planetarium from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'planetarium'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

1860

First Known Use of planetarium

1860


PLANETARIUM Defined for English Language Learners

planetarium

play
noun

Definition of planetarium for English Language Learners

  • : a building or room in which images of stars, planets, etc., are shown on a high, curved ceiling


PLANETARIUM Defined for Kids

planetarium

play
noun plan·e·tar·i·um \ˌpla-nə-ˈter-ē-əm\

Definition of planetarium for Students

  1. :  a building in which there is a device for projecting the images of heavenly bodies on a ceiling shaped like a dome



Seen and Heard

What made you want to look up planetarium? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

to glide in or as if in an airplane

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

  • istock-refers-to-this-as-a-tumble-of-strawberries-which-sounded-pretty-nice-to-us
  • Which is a synonym of garner?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!