Etymology

planetarium

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Today it means: A display museum in which images of stars and other astronomical phenomena are projected onto a domed ceiling. Full definition →

New Latin planētārium
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The story

  1. New Latin · borrowed fromplanētārium
  2. English todayplanetarium

Borrowed from New Latin planētārium. Equivalent to planet + -arium.

Etymology from Wiktionary, CC BY-SA 4.0.