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Webster 1913 Edition
Hypocycloid
Hyˊpo-cy′cloid
,Noun.
[Pref.
hypo-
+ cycloid
: cf. F. hypocycloïde
.] (Geom.)
A curve traced by a point in the circumference of a circle which rolls on the concave side in the fixed circle. Cf.
Epicycloid
, and Trochoid
.