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Definition of "planetarium" [plan•e•ta•ri•um]

  • An apparatus or model representing the solar system. (noun)
  • An optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome. (noun)
  • A building or room containing a planetarium, with seats for an audience. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Use "planetarium" in a sentence
  • "So you wonder who actually wrote that bit, when a planetarium is an excellent example of exciting science education for students, yet it's dismissed so casually more than once."
  • "(In homage to Nehru's interest in astronomy, the city's planetarium is next door.) 12: 10 A.M. INDIRA GANDHI"
  • "I'm sorry, did he call a planetarium "foolishness"?"
Words like "planetarium"