cometarium

Latin

• (Received Pronunciation) IPA^(key): /ˌkɒmɪˈtɛəɹi.əm/
• (General American) IPA^(key): /ˌkɑməˈtɛɹi.əm/
• Rhymes: -ɛəɹiəm

cometarium (plural cometaria)

1. (astronomy) An instrument intended to represent the revolution of a comet around the Sun.
   • 1791, Thomas Vivian, Cosmology. An Enquiry Into the Cause of what is Called Gravitation, Etc.:

     we have their [comets'] path marked in cometariums formed on the imaginary law of attraction

• “cometarium”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.