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epicotyl
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epicycloid
ep·i·cy·cloid [ èppi s klòyd ] (plural ep·i·cy·cloids)


noun 
Definition:
 
mathematical curve: a mathematical curve traced by a point on the circumference of a circle that rolls around the outside of the circumference of another circle

ep·i·cy·cloid·al [ èppi sī klóyd'l ] adjective
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