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hypnotism
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hypocycloid
hy·po·cy·cloid [ hpə s klòyd ] (plural hy·po·cy·cloids)


noun 
Definition:
 
geometric curve: in geometry, a curve traced by a point on the circumference of a circle as it rolls along the inside circumference of another circle

hy·po·cy·cloid·al [ hpə sī klóyd'l ] adjective
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