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Epicycle
Meaning
Noun
●
In Astronomy:
A
small circle
whose
centre
is on the
circumference
of a
larger
circle
; in Ptolemaic
astronomy
it was seen as the
basis
of
revolution
of the "seven
planets
", given a
fixed
central
Earth.
●
In Geometry:
Any
circle
whose
circumference
rolls around
that of another
circle
, thus
creating
a
hypocycloid
or epicycloid.
●
In Organic chemistry:
A
ring
of
atoms
joining
parts
of an already
cyclic
compound
●
An
ad
hoc
complication
ad
ded to a model to
make it
fit
the known data
Sourced from
Wiktionary
Origin
epicycle
English
epicyclus
Latin
ἐπίκυκλος
Ancient Greek (to 1453)
Sourced from
Etym
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