epicyclical

World English Dictionary
epicycle (ˈɛpɪˌsaɪkəl)
 
n
1.  astronomy (in the Ptolemaic system) a small circle, around which a planet was thought to revolve, whose centre describes a larger circle (the deferent) centred on the earth
2.  a circle that rolls around the inside or outside of another circle, so generating an epicycloid or hypocycloid
 
[C14: from Late Latin epicyclus, from Greek epikuklos; see epi-, cycle]
 
epicyclic
 
adj
 
epi'cyclical
 
adj

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