Usually means: Device for simulating comet orbits.
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We found 9 dictionaries that define the word cometarium:

General (9 matching dictionaries)
  1. cometarium: Wordnik
  2. cometarium: Wiktionary
  3. Cometarium: Dictionary.com
  4. Cometarium: Online Plain Text English Dictionary
  5. cometarium: Webster's Revised Unabridged, 1913 Edition
  6. Cometarium: AllWords.com Multi-Lingual Dictionary
  7. cometarium: Webster's 1828 Dictionary
  8. cometarium: FreeDictionary.org
  9. Cometarium: TheFreeDictionary.com

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Definitions from Wiktionary (cometarium)

▸ noun:  (astronomy) An instrument intended to represent the revolution of a comet around the Sun.

Similar:
comet, periodic comet, periodical comet, planetarium, cometopause, parabolic comet, tellurion, meteoroscope, cosmosphere, collimator, more...

Opposite:
asteroidarium, planetarium, observatory

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Similar:
comet, periodic comet, periodical comet, planetarium, cometopause, parabolic comet, tellurion, meteoroscope, cosmosphere, collimator, more...

Opposite:
asteroidarium, planetarium, observatory



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