Longman Dictionary of Contemporary English homepage

Date: 1700-1800
Language: Modern Latin
Origin: Latin planeta; PLANET

planetarium

 noun
     
Related topics: Astronomy
plan‧e‧tar‧i‧um [countable]
HA a building where lights on a curved ceiling show the movements of planets and stars
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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