- cometarium
- cometarium
(kɒmɪˈtɛərɪəm)[mod.L., f. comēta + -arium: after planetarium.]A mechanical contrivance (invented by Desaguliers) for illustrating motion in an eccentric orbit.J. Ferguson Astron. §405. 1867–77 G. F. Chambers Astron. Vocab. Def. 914.
Useful english dictionary. 2012.