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Webster 1913 Edition
Hypotrochoid
Hyˊpo-tro′choid
,Noun.
[Pref.
hypo-
+ trochoid
.] (Geom.)
A curve, traced by a point in the radius, or radius produced, of a circle which rolls upon the concave side of a fixed circle. See
Hypocycloid
, Epicycloid
, and Trochoid
.