Of, relating to, or resembling an epicycle or epicyclic motion; variant form of epicyclic.
An alternative adjectival form combining 'epicycle' with the suffix '-ical' instead of '-ic', following the pattern of words like 'mathematical' vs. 'mathematic'.
This is just a fancier, more formal version of 'epicyclic'—both mean the same thing, but 'epicyclical' sounds more like how a Victorian scientist would describe Ptolemy's astronomical models!
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